--- a/d3.js	Sun Aug 14 20:46:16 2016 +0100
+++ b/d3.js	Mon May 29 14:06:47 2017 +0100
@@ -1,9233 +1,16866 @@
-!function() {
-  var d3 = {
-    version: "3.4.11"
-  };
-  if (!Date.now) Date.now = function() {
-    return +new Date();
-  };
-  var d3_arraySlice = [].slice, d3_array = function(list) {
-    return d3_arraySlice.call(list);
-  };
-  var d3_document = document, d3_documentElement = d3_document.documentElement, d3_window = window;
-  try {
-    d3_array(d3_documentElement.childNodes)[0].nodeType;
-  } catch (e) {
-    d3_array = function(list) {
-      var i = list.length, array = new Array(i);
-      while (i--) array[i] = list[i];
-      return array;
-    };
-  }
-  try {
-    d3_document.createElement("div").style.setProperty("opacity", 0, "");
-  } catch (error) {
-    var d3_element_prototype = d3_window.Element.prototype, d3_element_setAttribute = d3_element_prototype.setAttribute, d3_element_setAttributeNS = d3_element_prototype.setAttributeNS, d3_style_prototype = d3_window.CSSStyleDeclaration.prototype, d3_style_setProperty = d3_style_prototype.setProperty;
-    d3_element_prototype.setAttribute = function(name, value) {
-      d3_element_setAttribute.call(this, name, value + "");
-    };
-    d3_element_prototype.setAttributeNS = function(space, local, value) {
-      d3_element_setAttributeNS.call(this, space, local, value + "");
-    };
-    d3_style_prototype.setProperty = function(name, value, priority) {
-      d3_style_setProperty.call(this, name, value + "", priority);
-    };
-  }
-  d3.ascending = d3_ascending;
-  function d3_ascending(a, b) {
-    return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
-  }
-  d3.descending = function(a, b) {
-    return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
-  };
-  d3.min = function(array, f) {
-    var i = -1, n = array.length, a, b;
-    if (arguments.length === 1) {
-      while (++i < n && !((a = array[i]) != null && a <= a)) a = undefined;
-      while (++i < n) if ((b = array[i]) != null && a > b) a = b;
-    } else {
-      while (++i < n && !((a = f.call(array, array[i], i)) != null && a <= a)) a = undefined;
-      while (++i < n) if ((b = f.call(array, array[i], i)) != null && a > b) a = b;
-    }
-    return a;
-  };
-  d3.max = function(array, f) {
-    var i = -1, n = array.length, a, b;
-    if (arguments.length === 1) {
-      while (++i < n && !((a = array[i]) != null && a <= a)) a = undefined;
-      while (++i < n) if ((b = array[i]) != null && b > a) a = b;
-    } else {
-      while (++i < n && !((a = f.call(array, array[i], i)) != null && a <= a)) a = undefined;
-      while (++i < n) if ((b = f.call(array, array[i], i)) != null && b > a) a = b;
-    }
-    return a;
-  };
-  d3.extent = function(array, f) {
-    var i = -1, n = array.length, a, b, c;
-    if (arguments.length === 1) {
-      while (++i < n && !((a = c = array[i]) != null && a <= a)) a = c = undefined;
-      while (++i < n) if ((b = array[i]) != null) {
-        if (a > b) a = b;
-        if (c < b) c = b;
-      }
-    } else {
-      while (++i < n && !((a = c = f.call(array, array[i], i)) != null && a <= a)) a = undefined;
-      while (++i < n) if ((b = f.call(array, array[i], i)) != null) {
-        if (a > b) a = b;
-        if (c < b) c = b;
-      }
-    }
-    return [ a, c ];
-  };
-  d3.sum = function(array, f) {
-    var s = 0, n = array.length, a, i = -1;
-    if (arguments.length === 1) {
-      while (++i < n) if (!isNaN(a = +array[i])) s += a;
-    } else {
-      while (++i < n) if (!isNaN(a = +f.call(array, array[i], i))) s += a;
-    }
-    return s;
-  };
-  function d3_number(x) {
-    return x != null && !isNaN(x);
-  }
-  d3.mean = function(array, f) {
-    var s = 0, n = array.length, a, i = -1, j = n;
-    if (arguments.length === 1) {
-      while (++i < n) if (d3_number(a = array[i])) s += a; else --j;
-    } else {
-      while (++i < n) if (d3_number(a = f.call(array, array[i], i))) s += a; else --j;
-    }
-    return j ? s / j : undefined;
-  };
-  d3.quantile = function(values, p) {
-    var H = (values.length - 1) * p + 1, h = Math.floor(H), v = +values[h - 1], e = H - h;
-    return e ? v + e * (values[h] - v) : v;
-  };
-  d3.median = function(array, f) {
-    if (arguments.length > 1) array = array.map(f);
-    array = array.filter(d3_number);
-    return array.length ? d3.quantile(array.sort(d3_ascending), .5) : undefined;
-  };
-  function d3_bisector(compare) {
-    return {
-      left: function(a, x, lo, hi) {
-        if (arguments.length < 3) lo = 0;
-        if (arguments.length < 4) hi = a.length;
-        while (lo < hi) {
-          var mid = lo + hi >>> 1;
-          if (compare(a[mid], x) < 0) lo = mid + 1; else hi = mid;
-        }
-        return lo;
-      },
-      right: function(a, x, lo, hi) {
-        if (arguments.length < 3) lo = 0;
-        if (arguments.length < 4) hi = a.length;
-        while (lo < hi) {
-          var mid = lo + hi >>> 1;
-          if (compare(a[mid], x) > 0) hi = mid; else lo = mid + 1;
-        }
-        return lo;
-      }
-    };
-  }
-  var d3_bisect = d3_bisector(d3_ascending);
-  d3.bisectLeft = d3_bisect.left;
-  d3.bisect = d3.bisectRight = d3_bisect.right;
-  d3.bisector = function(f) {
-    return d3_bisector(f.length === 1 ? function(d, x) {
-      return d3_ascending(f(d), x);
-    } : f);
-  };
-  d3.shuffle = function(array) {
-    var m = array.length, t, i;
-    while (m) {
-      i = Math.random() * m-- | 0;
-      t = array[m], array[m] = array[i], array[i] = t;
-    }
-    return array;
-  };
-  d3.permute = function(array, indexes) {
-    var i = indexes.length, permutes = new Array(i);
-    while (i--) permutes[i] = array[indexes[i]];
-    return permutes;
-  };
-  d3.pairs = function(array) {
-    var i = 0, n = array.length - 1, p0, p1 = array[0], pairs = new Array(n < 0 ? 0 : n);
-    while (i < n) pairs[i] = [ p0 = p1, p1 = array[++i] ];
-    return pairs;
-  };
-  d3.zip = function() {
-    if (!(n = arguments.length)) return [];
-    for (var i = -1, m = d3.min(arguments, d3_zipLength), zips = new Array(m); ++i < m; ) {
-      for (var j = -1, n, zip = zips[i] = new Array(n); ++j < n; ) {
-        zip[j] = arguments[j][i];
-      }
-    }
-    return zips;
-  };
-  function d3_zipLength(d) {
-    return d.length;
-  }
-  d3.transpose = function(matrix) {
-    return d3.zip.apply(d3, matrix);
-  };
-  d3.keys = function(map) {
-    var keys = [];
-    for (var key in map) keys.push(key);
-    return keys;
-  };
-  d3.values = function(map) {
-    var values = [];
-    for (var key in map) values.push(map[key]);
-    return values;
-  };
-  d3.entries = function(map) {
-    var entries = [];
-    for (var key in map) entries.push({
-      key: key,
-      value: map[key]
-    });
-    return entries;
-  };
-  d3.merge = function(arrays) {
-    var n = arrays.length, m, i = -1, j = 0, merged, array;
-    while (++i < n) j += arrays[i].length;
-    merged = new Array(j);
-    while (--n >= 0) {
-      array = arrays[n];
-      m = array.length;
-      while (--m >= 0) {
-        merged[--j] = array[m];
-      }
-    }
-    return merged;
-  };
-  var abs = Math.abs;
-  d3.range = function(start, stop, step) {
-    if (arguments.length < 3) {
-      step = 1;
-      if (arguments.length < 2) {
-        stop = start;
-        start = 0;
-      }
-    }
-    if ((stop - start) / step === Infinity) throw new Error("infinite range");
-    var range = [], k = d3_range_integerScale(abs(step)), i = -1, j;
-    start *= k, stop *= k, step *= k;
-    if (step < 0) while ((j = start + step * ++i) > stop) range.push(j / k); else while ((j = start + step * ++i) < stop) range.push(j / k);
-    return range;
-  };
-  function d3_range_integerScale(x) {
-    var k = 1;
-    while (x * k % 1) k *= 10;
-    return k;
-  }
-  function d3_class(ctor, properties) {
-    try {
-      for (var key in properties) {
-        Object.defineProperty(ctor.prototype, key, {
-          value: properties[key],
-          enumerable: false
-        });
-      }
-    } catch (e) {
-      ctor.prototype = properties;
-    }
-  }
-  d3.map = function(object) {
-    var map = new d3_Map();
-    if (object instanceof d3_Map) object.forEach(function(key, value) {
-      map.set(key, value);
-    }); else for (var key in object) map.set(key, object[key]);
-    return map;
-  };
-  function d3_Map() {}
-  d3_class(d3_Map, {
-    has: d3_map_has,
-    get: function(key) {
-      return this[d3_map_prefix + key];
+// https://d3js.org Version 4.9.1. Copyright 2017 Mike Bostock.
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+	typeof define === 'function' && define.amd ? define(['exports'], factory) :
+	(factory((global.d3 = global.d3 || {})));
+}(this, (function (exports) { 'use strict';
+
+var version = "4.9.1";
+
+var ascending = function(a, b) {
+  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
+};
+
+var bisector = function(compare) {
+  if (compare.length === 1) compare = ascendingComparator(compare);
+  return {
+    left: function(a, x, lo, hi) {
+      if (lo == null) lo = 0;
+      if (hi == null) hi = a.length;
+      while (lo < hi) {
+        var mid = lo + hi >>> 1;
+        if (compare(a[mid], x) < 0) lo = mid + 1;
+        else hi = mid;
+      }
+      return lo;
     },
-    set: function(key, value) {
-      return this[d3_map_prefix + key] = value;
-    },
-    remove: d3_map_remove,
-    keys: d3_map_keys,
-    values: function() {
-      var values = [];
-      this.forEach(function(key, value) {
-        values.push(value);
-      });
-      return values;
-    },
-    entries: function() {
-      var entries = [];
-      this.forEach(function(key, value) {
-        entries.push({
-          key: key,
-          value: value
-        });
-      });
-      return entries;
-    },
-    size: d3_map_size,
-    empty: d3_map_empty,
-    forEach: function(f) {
-      for (var key in this) if (key.charCodeAt(0) === d3_map_prefixCode) f.call(this, key.substring(1), this[key]);
-    }
+    right: function(a, x, lo, hi) {
+      if (lo == null) lo = 0;
+      if (hi == null) hi = a.length;
+      while (lo < hi) {
+        var mid = lo + hi >>> 1;
+        if (compare(a[mid], x) > 0) hi = mid;
+        else lo = mid + 1;
+      }
+      return lo;
+    }
+  };
+};
+
+function ascendingComparator(f) {
+  return function(d, x) {
+    return ascending(f(d), x);
+  };
+}
+
+var ascendingBisect = bisector(ascending);
+var bisectRight = ascendingBisect.right;
+var bisectLeft = ascendingBisect.left;
+
+var pairs = function(array, f) {
+  if (f == null) f = pair;
+  var i = 0, n = array.length - 1, p = array[0], pairs = new Array(n < 0 ? 0 : n);
+  while (i < n) pairs[i] = f(p, p = array[++i]);
+  return pairs;
+};
+
+function pair(a, b) {
+  return [a, b];
+}
+
+var cross = function(values0, values1, reduce) {
+  var n0 = values0.length,
+      n1 = values1.length,
+      values = new Array(n0 * n1),
+      i0,
+      i1,
+      i,
+      value0;
+
+  if (reduce == null) reduce = pair;
+
+  for (i0 = i = 0; i0 < n0; ++i0) {
+    for (value0 = values0[i0], i1 = 0; i1 < n1; ++i1, ++i) {
+      values[i] = reduce(value0, values1[i1]);
+    }
+  }
+
+  return values;
+};
+
+var descending = function(a, b) {
+  return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
+};
+
+var number = function(x) {
+  return x === null ? NaN : +x;
+};
+
+var variance = function(values, valueof) {
+  var n = values.length,
+      m = 0,
+      i = -1,
+      mean = 0,
+      value,
+      delta,
+      sum = 0;
+
+  if (valueof == null) {
+    while (++i < n) {
+      if (!isNaN(value = number(values[i]))) {
+        delta = value - mean;
+        mean += delta / ++m;
+        sum += delta * (value - mean);
+      }
+    }
+  }
+
+  else {
+    while (++i < n) {
+      if (!isNaN(value = number(valueof(values[i], i, values)))) {
+        delta = value - mean;
+        mean += delta / ++m;
+        sum += delta * (value - mean);
+      }
+    }
+  }
+
+  if (m > 1) return sum / (m - 1);
+};
+
+var deviation = function(array, f) {
+  var v = variance(array, f);
+  return v ? Math.sqrt(v) : v;
+};
+
+var extent = function(values, valueof) {
+  var n = values.length,
+      i = -1,
+      value,
+      min,
+      max;
+
+  if (valueof == null) {
+    while (++i < n) { // Find the first comparable value.
+      if ((value = values[i]) != null && value >= value) {
+        min = max = value;
+        while (++i < n) { // Compare the remaining values.
+          if ((value = values[i]) != null) {
+            if (min > value) min = value;
+            if (max < value) max = value;
+          }
+        }
+      }
+    }
+  }
+
+  else {
+    while (++i < n) { // Find the first comparable value.
+      if ((value = valueof(values[i], i, values)) != null && value >= value) {
+        min = max = value;
+        while (++i < n) { // Compare the remaining values.
+          if ((value = valueof(values[i], i, values)) != null) {
+            if (min > value) min = value;
+            if (max < value) max = value;
+          }
+        }
+      }
+    }
+  }
+
+  return [min, max];
+};
+
+var array = Array.prototype;
+
+var slice = array.slice;
+var map = array.map;
+
+var constant = function(x) {
+  return function() {
+    return x;
+  };
+};
+
+var identity = function(x) {
+  return x;
+};
+
+var sequence = function(start, stop, step) {
+  start = +start, stop = +stop, step = (n = arguments.length) < 2 ? (stop = start, start = 0, 1) : n < 3 ? 1 : +step;
+
+  var i = -1,
+      n = Math.max(0, Math.ceil((stop - start) / step)) | 0,
+      range = new Array(n);
+
+  while (++i < n) {
+    range[i] = start + i * step;
+  }
+
+  return range;
+};
+
+var e10 = Math.sqrt(50);
+var e5 = Math.sqrt(10);
+var e2 = Math.sqrt(2);
+
+var ticks = function(start, stop, count) {
+  var reverse = stop < start,
+      i = -1,
+      n,
+      ticks,
+      step;
+
+  if (reverse) n = start, start = stop, stop = n;
+
+  if ((step = tickIncrement(start, stop, count)) === 0 || !isFinite(step)) return [];
+
+  if (step > 0) {
+    start = Math.ceil(start / step);
+    stop = Math.floor(stop / step);
+    ticks = new Array(n = Math.ceil(stop - start + 1));
+    while (++i < n) ticks[i] = (start + i) * step;
+  } else {
+    start = Math.floor(start * step);
+    stop = Math.ceil(stop * step);
+    ticks = new Array(n = Math.ceil(start - stop + 1));
+    while (++i < n) ticks[i] = (start - i) / step;
+  }
+
+  if (reverse) ticks.reverse();
+
+  return ticks;
+};
+
+function tickIncrement(start, stop, count) {
+  var step = (stop - start) / Math.max(0, count),
+      power = Math.floor(Math.log(step) / Math.LN10),
+      error = step / Math.pow(10, power);
+  return power >= 0
+      ? (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1) * Math.pow(10, power)
+      : -Math.pow(10, -power) / (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1);
+}
+
+function tickStep(start, stop, count) {
+  var step0 = Math.abs(stop - start) / Math.max(0, count),
+      step1 = Math.pow(10, Math.floor(Math.log(step0) / Math.LN10)),
+      error = step0 / step1;
+  if (error >= e10) step1 *= 10;
+  else if (error >= e5) step1 *= 5;
+  else if (error >= e2) step1 *= 2;
+  return stop < start ? -step1 : step1;
+}
+
+var sturges = function(values) {
+  return Math.ceil(Math.log(values.length) / Math.LN2) + 1;
+};
+
+var histogram = function() {
+  var value = identity,
+      domain = extent,
+      threshold = sturges;
+
+  function histogram(data) {
+    var i,
+        n = data.length,
+        x,
+        values = new Array(n);
+
+    for (i = 0; i < n; ++i) {
+      values[i] = value(data[i], i, data);
+    }
+
+    var xz = domain(values),
+        x0 = xz[0],
+        x1 = xz[1],
+        tz = threshold(values, x0, x1);
+
+    // Convert number of thresholds into uniform thresholds.
+    if (!Array.isArray(tz)) {
+      tz = tickStep(x0, x1, tz);
+      tz = sequence(Math.ceil(x0 / tz) * tz, Math.floor(x1 / tz) * tz, tz); // exclusive
+    }
+
+    // Remove any thresholds outside the domain.
+    var m = tz.length;
+    while (tz[0] <= x0) tz.shift(), --m;
+    while (tz[m - 1] > x1) tz.pop(), --m;
+
+    var bins = new Array(m + 1),
+        bin;
+
+    // Initialize bins.
+    for (i = 0; i <= m; ++i) {
+      bin = bins[i] = [];
+      bin.x0 = i > 0 ? tz[i - 1] : x0;
+      bin.x1 = i < m ? tz[i] : x1;
+    }
+
+    // Assign data to bins by value, ignoring any outside the domain.
+    for (i = 0; i < n; ++i) {
+      x = values[i];
+      if (x0 <= x && x <= x1) {
+        bins[bisectRight(tz, x, 0, m)].push(data[i]);
+      }
+    }
+
+    return bins;
+  }
+
+  histogram.value = function(_) {
+    return arguments.length ? (value = typeof _ === "function" ? _ : constant(_), histogram) : value;
+  };
+
+  histogram.domain = function(_) {
+    return arguments.length ? (domain = typeof _ === "function" ? _ : constant([_[0], _[1]]), histogram) : domain;
+  };
+
+  histogram.thresholds = function(_) {
+    return arguments.length ? (threshold = typeof _ === "function" ? _ : Array.isArray(_) ? constant(slice.call(_)) : constant(_), histogram) : threshold;
+  };
+
+  return histogram;
+};
+
+var threshold = function(values, p, valueof) {
+  if (valueof == null) valueof = number;
+  if (!(n = values.length)) return;
+  if ((p = +p) <= 0 || n < 2) return +valueof(values[0], 0, values);
+  if (p >= 1) return +valueof(values[n - 1], n - 1, values);
+  var n,
+      i = (n - 1) * p,
+      i0 = Math.floor(i),
+      value0 = +valueof(values[i0], i0, values),
+      value1 = +valueof(values[i0 + 1], i0 + 1, values);
+  return value0 + (value1 - value0) * (i - i0);
+};
+
+var freedmanDiaconis = function(values, min, max) {
+  values = map.call(values, number).sort(ascending);
+  return Math.ceil((max - min) / (2 * (threshold(values, 0.75) - threshold(values, 0.25)) * Math.pow(values.length, -1 / 3)));
+};
+
+var scott = function(values, min, max) {
+  return Math.ceil((max - min) / (3.5 * deviation(values) * Math.pow(values.length, -1 / 3)));
+};
+
+var max = function(values, valueof) {
+  var n = values.length,
+      i = -1,
+      value,
+      max;
+
+  if (valueof == null) {
+    while (++i < n) { // Find the first comparable value.
+      if ((value = values[i]) != null && value >= value) {
+        max = value;
+        while (++i < n) { // Compare the remaining values.
+          if ((value = values[i]) != null && value > max) {
+            max = value;
+          }
+        }
+      }
+    }
+  }
+
+  else {
+    while (++i < n) { // Find the first comparable value.
+      if ((value = valueof(values[i], i, values)) != null && value >= value) {
+        max = value;
+        while (++i < n) { // Compare the remaining values.
+          if ((value = valueof(values[i], i, values)) != null && value > max) {
+            max = value;
+          }
+        }
+      }
+    }
+  }
+
+  return max;
+};
+
+var mean = function(values, valueof) {
+  var n = values.length,
+      m = n,
+      i = -1,
+      value,
+      sum = 0;
+
+  if (valueof == null) {
+    while (++i < n) {
+      if (!isNaN(value = number(values[i]))) sum += value;
+      else --m;
+    }
+  }
+
+  else {
+    while (++i < n) {
+      if (!isNaN(value = number(valueof(values[i], i, values)))) sum += value;
+      else --m;
+    }
+  }
+
+  if (m) return sum / m;
+};
+
+var median = function(values, valueof) {
+  var n = values.length,
+      i = -1,
+      value,
+      numbers = [];
+
+  if (valueof == null) {
+    while (++i < n) {
+      if (!isNaN(value = number(values[i]))) {
+        numbers.push(value);
+      }
+    }
+  }
+
+  else {
+    while (++i < n) {
+      if (!isNaN(value = number(valueof(values[i], i, values)))) {
+        numbers.push(value);
+      }
+    }
+  }
+
+  return threshold(numbers.sort(ascending), 0.5);
+};
+
+var merge = function(arrays) {
+  var n = arrays.length,
+      m,
+      i = -1,
+      j = 0,
+      merged,
+      array;
+
+  while (++i < n) j += arrays[i].length;
+  merged = new Array(j);
+
+  while (--n >= 0) {
+    array = arrays[n];
+    m = array.length;
+    while (--m >= 0) {
+      merged[--j] = array[m];
+    }
+  }
+
+  return merged;
+};
+
+var min = function(values, valueof) {
+  var n = values.length,
+      i = -1,
+      value,
+      min;
+
+  if (valueof == null) {
+    while (++i < n) { // Find the first comparable value.
+      if ((value = values[i]) != null && value >= value) {
+        min = value;
+        while (++i < n) { // Compare the remaining values.
+          if ((value = values[i]) != null && min > value) {
+            min = value;
+          }
+        }
+      }
+    }
+  }
+
+  else {
+    while (++i < n) { // Find the first comparable value.
+      if ((value = valueof(values[i], i, values)) != null && value >= value) {
+        min = value;
+        while (++i < n) { // Compare the remaining values.
+          if ((value = valueof(values[i], i, values)) != null && min > value) {
+            min = value;
+          }
+        }
+      }
+    }
+  }
+
+  return min;
+};
+
+var permute = function(array, indexes) {
+  var i = indexes.length, permutes = new Array(i);
+  while (i--) permutes[i] = array[indexes[i]];
+  return permutes;
+};
+
+var scan = function(values, compare) {
+  if (!(n = values.length)) return;
+  var n,
+      i = 0,
+      j = 0,
+      xi,
+      xj = values[j];
+
+  if (compare == null) compare = ascending;
+
+  while (++i < n) {
+    if (compare(xi = values[i], xj) < 0 || compare(xj, xj) !== 0) {
+      xj = xi, j = i;
+    }
+  }
+
+  if (compare(xj, xj) === 0) return j;
+};
+
+var shuffle = function(array, i0, i1) {
+  var m = (i1 == null ? array.length : i1) - (i0 = i0 == null ? 0 : +i0),
+      t,
+      i;
+
+  while (m) {
+    i = Math.random() * m-- | 0;
+    t = array[m + i0];
+    array[m + i0] = array[i + i0];
+    array[i + i0] = t;
+  }
+
+  return array;
+};
+
+var sum = function(values, valueof) {
+  var n = values.length,
+      i = -1,
+      value,
+      sum = 0;
+
+  if (valueof == null) {
+    while (++i < n) {
+      if (value = +values[i]) sum += value; // Note: zero and null are equivalent.
+    }
+  }
+
+  else {
+    while (++i < n) {
+      if (value = +valueof(values[i], i, values)) sum += value;
+    }
+  }
+
+  return sum;
+};
+
+var transpose = function(matrix) {
+  if (!(n = matrix.length)) return [];
+  for (var i = -1, m = min(matrix, length), transpose = new Array(m); ++i < m;) {
+    for (var j = -1, n, row = transpose[i] = new Array(n); ++j < n;) {
+      row[j] = matrix[j][i];
+    }
+  }
+  return transpose;
+};
+
+function length(d) {
+  return d.length;
+}
+
+var zip = function() {
+  return transpose(arguments);
+};
+
+var slice$1 = Array.prototype.slice;
+
+var identity$1 = function(x) {
+  return x;
+};
+
+var top = 1;
+var right = 2;
+var bottom = 3;
+var left = 4;
+var epsilon = 1e-6;
+
+function translateX(x) {
+  return "translate(" + (x + 0.5) + ",0)";
+}
+
+function translateY(y) {
+  return "translate(0," + (y + 0.5) + ")";
+}
+
+function center(scale) {
+  var offset = Math.max(0, scale.bandwidth() - 1) / 2; // Adjust for 0.5px offset.
+  if (scale.round()) offset = Math.round(offset);
+  return function(d) {
+    return scale(d) + offset;
+  };
+}
+
+function entering() {
+  return !this.__axis;
+}
+
+function axis(orient, scale) {
+  var tickArguments = [],
+      tickValues = null,
+      tickFormat = null,
+      tickSizeInner = 6,
+      tickSizeOuter = 6,
+      tickPadding = 3,
+      k = orient === top || orient === left ? -1 : 1,
+      x = orient === left || orient === right ? "x" : "y",
+      transform = orient === top || orient === bottom ? translateX : translateY;
+
+  function axis(context) {
+    var values = tickValues == null ? (scale.ticks ? scale.ticks.apply(scale, tickArguments) : scale.domain()) : tickValues,
+        format = tickFormat == null ? (scale.tickFormat ? scale.tickFormat.apply(scale, tickArguments) : identity$1) : tickFormat,
+        spacing = Math.max(tickSizeInner, 0) + tickPadding,
+        range = scale.range(),
+        range0 = range[0] + 0.5,
+        range1 = range[range.length - 1] + 0.5,
+        position = (scale.bandwidth ? center : identity$1)(scale.copy()),
+        selection = context.selection ? context.selection() : context,
+        path = selection.selectAll(".domain").data([null]),
+        tick = selection.selectAll(".tick").data(values, scale).order(),
+        tickExit = tick.exit(),
+        tickEnter = tick.enter().append("g").attr("class", "tick"),
+        line = tick.select("line"),
+        text = tick.select("text");
+
+    path = path.merge(path.enter().insert("path", ".tick")
+        .attr("class", "domain")
+        .attr("stroke", "#000"));
+
+    tick = tick.merge(tickEnter);
+
+    line = line.merge(tickEnter.append("line")
+        .attr("stroke", "#000")
+        .attr(x + "2", k * tickSizeInner));
+
+    text = text.merge(tickEnter.append("text")
+        .attr("fill", "#000")
+        .attr(x, k * spacing)
+        .attr("dy", orient === top ? "0em" : orient === bottom ? "0.71em" : "0.32em"));
+
+    if (context !== selection) {
+      path = path.transition(context);
+      tick = tick.transition(context);
+      line = line.transition(context);
+      text = text.transition(context);
+
+      tickExit = tickExit.transition(context)
+          .attr("opacity", epsilon)
+          .attr("transform", function(d) { return isFinite(d = position(d)) ? transform(d) : this.getAttribute("transform"); });
+
+      tickEnter
+          .attr("opacity", epsilon)
+          .attr("transform", function(d) { var p = this.parentNode.__axis; return transform(p && isFinite(p = p(d)) ? p : position(d)); });
+    }
+
+    tickExit.remove();
+
+    path
+        .attr("d", orient === left || orient == right
+            ? "M" + k * tickSizeOuter + "," + range0 + "H0.5V" + range1 + "H" + k * tickSizeOuter
+            : "M" + range0 + "," + k * tickSizeOuter + "V0.5H" + range1 + "V" + k * tickSizeOuter);
+
+    tick
+        .attr("opacity", 1)
+        .attr("transform", function(d) { return transform(position(d)); });
+
+    line
+        .attr(x + "2", k * tickSizeInner);
+
+    text
+        .attr(x, k * spacing)
+        .text(format);
+
+    selection.filter(entering)
+        .attr("fill", "none")
+        .attr("font-size", 10)
+        .attr("font-family", "sans-serif")
+        .attr("text-anchor", orient === right ? "start" : orient === left ? "end" : "middle");
+
+    selection
+        .each(function() { this.__axis = position; });
+  }
+
+  axis.scale = function(_) {
+    return arguments.length ? (scale = _, axis) : scale;
+  };
+
+  axis.ticks = function() {
+    return tickArguments = slice$1.call(arguments), axis;
+  };
+
+  axis.tickArguments = function(_) {
+    return arguments.length ? (tickArguments = _ == null ? [] : slice$1.call(_), axis) : tickArguments.slice();
+  };
+
+  axis.tickValues = function(_) {
+    return arguments.length ? (tickValues = _ == null ? null : slice$1.call(_), axis) : tickValues && tickValues.slice();
+  };
+
+  axis.tickFormat = function(_) {
+    return arguments.length ? (tickFormat = _, axis) : tickFormat;
+  };
+
+  axis.tickSize = function(_) {
+    return arguments.length ? (tickSizeInner = tickSizeOuter = +_, axis) : tickSizeInner;
+  };
+
+  axis.tickSizeInner = function(_) {
+    return arguments.length ? (tickSizeInner = +_, axis) : tickSizeInner;
+  };
+
+  axis.tickSizeOuter = function(_) {
+    return arguments.length ? (tickSizeOuter = +_, axis) : tickSizeOuter;
+  };
+
+  axis.tickPadding = function(_) {
+    return arguments.length ? (tickPadding = +_, axis) : tickPadding;
+  };
+
+  return axis;
+}
+
+function axisTop(scale) {
+  return axis(top, scale);
+}
+
+function axisRight(scale) {
+  return axis(right, scale);
+}
+
+function axisBottom(scale) {
+  return axis(bottom, scale);
+}
+
+function axisLeft(scale) {
+  return axis(left, scale);
+}
+
+var noop = {value: function() {}};
+
+function dispatch() {
+  for (var i = 0, n = arguments.length, _ = {}, t; i < n; ++i) {
+    if (!(t = arguments[i] + "") || (t in _)) throw new Error("illegal type: " + t);
+    _[t] = [];
+  }
+  return new Dispatch(_);
+}
+
+function Dispatch(_) {
+  this._ = _;
+}
+
+function parseTypenames(typenames, types) {
+  return typenames.trim().split(/^|\s+/).map(function(t) {
+    var name = "", i = t.indexOf(".");
+    if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);
+    if (t && !types.hasOwnProperty(t)) throw new Error("unknown type: " + t);
+    return {type: t, name: name};
   });
-  var d3_map_prefix = "\x00", d3_map_prefixCode = d3_map_prefix.charCodeAt(0);
-  function d3_map_has(key) {
-    return d3_map_prefix + key in this;
-  }
-  function d3_map_remove(key) {
-    key = d3_map_prefix + key;
-    return key in this && delete this[key];
-  }
-  function d3_map_keys() {
-    var keys = [];
-    this.forEach(function(key) {
-      keys.push(key);
-    });
-    return keys;
-  }
-  function d3_map_size() {
-    var size = 0;
-    for (var key in this) if (key.charCodeAt(0) === d3_map_prefixCode) ++size;
-    return size;
-  }
-  function d3_map_empty() {
-    for (var key in this) if (key.charCodeAt(0) === d3_map_prefixCode) return false;
-    return true;
-  }
-  d3.nest = function() {
-    var nest = {}, keys = [], sortKeys = [], sortValues, rollup;
-    function map(mapType, array, depth) {
-      if (depth >= keys.length) return rollup ? rollup.call(nest, array) : sortValues ? array.sort(sortValues) : array;
-      var i = -1, n = array.length, key = keys[depth++], keyValue, object, setter, valuesByKey = new d3_Map(), values;
-      while (++i < n) {
-        if (values = valuesByKey.get(keyValue = key(object = array[i]))) {
-          values.push(object);
-        } else {
-          valuesByKey.set(keyValue, [ object ]);
-        }
-      }
-      if (mapType) {
-        object = mapType();
-        setter = function(keyValue, values) {
-          object.set(keyValue, map(mapType, values, depth));
-        };
-      } else {
-        object = {};
-        setter = function(keyValue, values) {
-          object[keyValue] = map(mapType, values, depth);
-        };
-      }
-      valuesByKey.forEach(setter);
-      return object;
-    }
-    function entries(map, depth) {
-      if (depth >= keys.length) return map;
-      var array = [], sortKey = sortKeys[depth++];
-      map.forEach(function(key, keyMap) {
-        array.push({
-          key: key,
-          values: entries(keyMap, depth)
-        });
-      });
-      return sortKey ? array.sort(function(a, b) {
-        return sortKey(a.key, b.key);
-      }) : array;
-    }
-    nest.map = function(array, mapType) {
-      return map(mapType, array, 0);
-    };
-    nest.entries = function(array) {
-      return entries(map(d3.map, array, 0), 0);
-    };
-    nest.key = function(d) {
-      keys.push(d);
-      return nest;
-    };
-    nest.sortKeys = function(order) {
-      sortKeys[keys.length - 1] = order;
-      return nest;
-    };
-    nest.sortValues = function(order) {
-      sortValues = order;
-      return nest;
-    };
-    nest.rollup = function(f) {
-      rollup = f;
-      return nest;
-    };
-    return nest;
-  };
-  d3.set = function(array) {
-    var set = new d3_Set();
-    if (array) for (var i = 0, n = array.length; i < n; ++i) set.add(array[i]);
-    return set;
-  };
-  function d3_Set() {}
-  d3_class(d3_Set, {
-    has: d3_map_has,
-    add: function(value) {
-      this[d3_map_prefix + value] = true;
-      return value;
-    },
-    remove: function(value) {
-      value = d3_map_prefix + value;
-      return value in this && delete this[value];
-    },
-    values: d3_map_keys,
-    size: d3_map_size,
-    empty: d3_map_empty,
-    forEach: function(f) {
-      for (var value in this) if (value.charCodeAt(0) === d3_map_prefixCode) f.call(this, value.substring(1));
-    }
-  });
-  d3.behavior = {};
-  d3.rebind = function(target, source) {
-    var i = 1, n = arguments.length, method;
-    while (++i < n) target[method = arguments[i]] = d3_rebind(target, source, source[method]);
-    return target;
-  };
-  function d3_rebind(target, source, method) {
-    return function() {
-      var value = method.apply(source, arguments);
-      return value === source ? target : value;
-    };
-  }
-  function d3_vendorSymbol(object, name) {
-    if (name in object) return name;
-    name = name.charAt(0).toUpperCase() + name.substring(1);
-    for (var i = 0, n = d3_vendorPrefixes.length; i < n; ++i) {
-      var prefixName = d3_vendorPrefixes[i] + name;
-      if (prefixName in object) return prefixName;
-    }
-  }
-  var d3_vendorPrefixes = [ "webkit", "ms", "moz", "Moz", "o", "O" ];
-  function d3_noop() {}
-  d3.dispatch = function() {
-    var dispatch = new d3_dispatch(), i = -1, n = arguments.length;
-    while (++i < n) dispatch[arguments[i]] = d3_dispatch_event(dispatch);
-    return dispatch;
-  };
-  function d3_dispatch() {}
-  d3_dispatch.prototype.on = function(type, listener) {
-    var i = type.indexOf("."), name = "";
-    if (i >= 0) {
-      name = type.substring(i + 1);
-      type = type.substring(0, i);
-    }
-    if (type) return arguments.length < 2 ? this[type].on(name) : this[type].on(name, listener);
-    if (arguments.length === 2) {
-      if (listener == null) for (type in this) {
-        if (this.hasOwnProperty(type)) this[type].on(name, null);
-      }
-      return this;
-    }
-  };
-  function d3_dispatch_event(dispatch) {
-    var listeners = [], listenerByName = new d3_Map();
-    function event() {
-      var z = listeners, i = -1, n = z.length, l;
-      while (++i < n) if (l = z[i].on) l.apply(this, arguments);
-      return dispatch;
-    }
-    event.on = function(name, listener) {
-      var l = listenerByName.get(name), i;
-      if (arguments.length < 2) return l && l.on;
-      if (l) {
-        l.on = null;
-        listeners = listeners.slice(0, i = listeners.indexOf(l)).concat(listeners.slice(i + 1));
-        listenerByName.remove(name);
-      }
-      if (listener) listeners.push(listenerByName.set(name, {
-        on: listener
-      }));
-      return dispatch;
-    };
-    return event;
-  }
-  d3.event = null;
-  function d3_eventPreventDefault() {
-    d3.event.preventDefault();
-  }
-  function d3_eventSource() {
-    var e = d3.event, s;
-    while (s = e.sourceEvent) e = s;
-    return e;
-  }
-  function d3_eventDispatch(target) {
-    var dispatch = new d3_dispatch(), i = 0, n = arguments.length;
-    while (++i < n) dispatch[arguments[i]] = d3_dispatch_event(dispatch);
-    dispatch.of = function(thiz, argumentz) {
-      return function(e1) {
-        try {
-          var e0 = e1.sourceEvent = d3.event;
-          e1.target = target;
-          d3.event = e1;
-          dispatch[e1.type].apply(thiz, argumentz);
-        } finally {
-          d3.event = e0;
-        }
+}
+
+Dispatch.prototype = dispatch.prototype = {
+  constructor: Dispatch,
+  on: function(typename, callback) {
+    var _ = this._,
+        T = parseTypenames(typename + "", _),
+        t,
+        i = -1,
+        n = T.length;
+
+    // If no callback was specified, return the callback of the given type and name.
+    if (arguments.length < 2) {
+      while (++i < n) if ((t = (typename = T[i]).type) && (t = get(_[t], typename.name))) return t;
+      return;
+    }
+
+    // If a type was specified, set the callback for the given type and name.
+    // Otherwise, if a null callback was specified, remove callbacks of the given name.
+    if (callback != null && typeof callback !== "function") throw new Error("invalid callback: " + callback);
+    while (++i < n) {
+      if (t = (typename = T[i]).type) _[t] = set(_[t], typename.name, callback);
+      else if (callback == null) for (t in _) _[t] = set(_[t], typename.name, null);
+    }
+
+    return this;
+  },
+  copy: function() {
+    var copy = {}, _ = this._;
+    for (var t in _) copy[t] = _[t].slice();
+    return new Dispatch(copy);
+  },
+  call: function(type, that) {
+    if ((n = arguments.length - 2) > 0) for (var args = new Array(n), i = 0, n, t; i < n; ++i) args[i] = arguments[i + 2];
+    if (!this._.hasOwnProperty(type)) throw new Error("unknown type: " + type);
+    for (t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);
+  },
+  apply: function(type, that, args) {
+    if (!this._.hasOwnProperty(type)) throw new Error("unknown type: " + type);
+    for (var t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);
+  }
+};
+
+function get(type, name) {
+  for (var i = 0, n = type.length, c; i < n; ++i) {
+    if ((c = type[i]).name === name) {
+      return c.value;
+    }
+  }
+}
+
+function set(type, name, callback) {
+  for (var i = 0, n = type.length; i < n; ++i) {
+    if (type[i].name === name) {
+      type[i] = noop, type = type.slice(0, i).concat(type.slice(i + 1));
+      break;
+    }
+  }
+  if (callback != null) type.push({name: name, value: callback});
+  return type;
+}
+
+var xhtml = "http://www.w3.org/1999/xhtml";
+
+var namespaces = {
+  svg: "http://www.w3.org/2000/svg",
+  xhtml: xhtml,
+  xlink: "http://www.w3.org/1999/xlink",
+  xml: "http://www.w3.org/XML/1998/namespace",
+  xmlns: "http://www.w3.org/2000/xmlns/"
+};
+
+var namespace = function(name) {
+  var prefix = name += "", i = prefix.indexOf(":");
+  if (i >= 0 && (prefix = name.slice(0, i)) !== "xmlns") name = name.slice(i + 1);
+  return namespaces.hasOwnProperty(prefix) ? {space: namespaces[prefix], local: name} : name;
+};
+
+function creatorInherit(name) {
+  return function() {
+    var document = this.ownerDocument,
+        uri = this.namespaceURI;
+    return uri === xhtml && document.documentElement.namespaceURI === xhtml
+        ? document.createElement(name)
+        : document.createElementNS(uri, name);
+  };
+}
+
+function creatorFixed(fullname) {
+  return function() {
+    return this.ownerDocument.createElementNS(fullname.space, fullname.local);
+  };
+}
+
+var creator = function(name) {
+  var fullname = namespace(name);
+  return (fullname.local
+      ? creatorFixed
+      : creatorInherit)(fullname);
+};
+
+var nextId = 0;
+
+function local$1() {
+  return new Local;
+}
+
+function Local() {
+  this._ = "@" + (++nextId).toString(36);
+}
+
+Local.prototype = local$1.prototype = {
+  constructor: Local,
+  get: function(node) {
+    var id = this._;
+    while (!(id in node)) if (!(node = node.parentNode)) return;
+    return node[id];
+  },
+  set: function(node, value) {
+    return node[this._] = value;
+  },
+  remove: function(node) {
+    return this._ in node && delete node[this._];
+  },
+  toString: function() {
+    return this._;
+  }
+};
+
+var matcher = function(selector) {
+  return function() {
+    return this.matches(selector);
+  };
+};
+
+if (typeof document !== "undefined") {
+  var element = document.documentElement;
+  if (!element.matches) {
+    var vendorMatches = element.webkitMatchesSelector
+        || element.msMatchesSelector
+        || element.mozMatchesSelector
+        || element.oMatchesSelector;
+    matcher = function(selector) {
+      return function() {
+        return vendorMatches.call(this, selector);
       };
     };
-    return dispatch;
-  }
-  d3.requote = function(s) {
-    return s.replace(d3_requote_re, "\\$&");
-  };
-  var d3_requote_re = /[\\\^\$\*\+\?\|\[\]\(\)\.\{\}]/g;
-  var d3_subclass = {}.__proto__ ? function(object, prototype) {
-    object.__proto__ = prototype;
-  } : function(object, prototype) {
-    for (var property in prototype) object[property] = prototype[property];
-  };
-  function d3_selection(groups) {
-    d3_subclass(groups, d3_selectionPrototype);
-    return groups;
-  }
-  var d3_select = function(s, n) {
-    return n.querySelector(s);
-  }, d3_selectAll = function(s, n) {
-    return n.querySelectorAll(s);
-  }, d3_selectMatcher = d3_documentElement.matches || d3_documentElement[d3_vendorSymbol(d3_documentElement, "matchesSelector")], d3_selectMatches = function(n, s) {
-    return d3_selectMatcher.call(n, s);
-  };
-  if (typeof Sizzle === "function") {
-    d3_select = function(s, n) {
-      return Sizzle(s, n)[0] || null;
-    };
-    d3_selectAll = Sizzle;
-    d3_selectMatches = Sizzle.matchesSelector;
-  }
-  d3.selection = function() {
-    return d3_selectionRoot;
-  };
-  var d3_selectionPrototype = d3.selection.prototype = [];
-  d3_selectionPrototype.select = function(selector) {
-    var subgroups = [], subgroup, subnode, group, node;
-    selector = d3_selection_selector(selector);
-    for (var j = -1, m = this.length; ++j < m; ) {
-      subgroups.push(subgroup = []);
-      subgroup.parentNode = (group = this[j]).parentNode;
-      for (var i = -1, n = group.length; ++i < n; ) {
-        if (node = group[i]) {
-          subgroup.push(subnode = selector.call(node, node.__data__, i, j));
-          if (subnode && "__data__" in node) subnode.__data__ = node.__data__;
-        } else {
-          subgroup.push(null);
-        }
-      }
-    }
-    return d3_selection(subgroups);
-  };
-  function d3_selection_selector(selector) {
-    return typeof selector === "function" ? selector : function() {
-      return d3_select(selector, this);
-    };
-  }
-  d3_selectionPrototype.selectAll = function(selector) {
-    var subgroups = [], subgroup, node;
-    selector = d3_selection_selectorAll(selector);
-    for (var j = -1, m = this.length; ++j < m; ) {
-      for (var group = this[j], i = -1, n = group.length; ++i < n; ) {
-        if (node = group[i]) {
-          subgroups.push(subgroup = d3_array(selector.call(node, node.__data__, i, j)));
-          subgroup.parentNode = node;
-        }
-      }
-    }
-    return d3_selection(subgroups);
-  };
-  function d3_selection_selectorAll(selector) {
-    return typeof selector === "function" ? selector : function() {
-      return d3_selectAll(selector, this);
-    };
-  }
-  var d3_nsPrefix = {
-    svg: "http://www.w3.org/2000/svg",
-    xhtml: "http://www.w3.org/1999/xhtml",
-    xlink: "http://www.w3.org/1999/xlink",
-    xml: "http://www.w3.org/XML/1998/namespace",
-    xmlns: "http://www.w3.org/2000/xmlns/"
-  };
-  d3.ns = {
-    prefix: d3_nsPrefix,
-    qualify: function(name) {
-      var i = name.indexOf(":"), prefix = name;
-      if (i >= 0) {
-        prefix = name.substring(0, i);
-        name = name.substring(i + 1);
-      }
-      return d3_nsPrefix.hasOwnProperty(prefix) ? {
-        space: d3_nsPrefix[prefix],
-        local: name
-      } : name;
-    }
-  };
-  d3_selectionPrototype.attr = function(name, value) {
-    if (arguments.length < 2) {
-      if (typeof name === "string") {
-        var node = this.node();
-        name = d3.ns.qualify(name);
-        return name.local ? node.getAttributeNS(name.space, name.local) : node.getAttribute(name);
-      }
-      for (value in name) this.each(d3_selection_attr(value, name[value]));
-      return this;
-    }
-    return this.each(d3_selection_attr(name, value));
-  };
-  function d3_selection_attr(name, value) {
-    name = d3.ns.qualify(name);
-    function attrNull() {
-      this.removeAttribute(name);
-    }
-    function attrNullNS() {
-      this.removeAttributeNS(name.space, name.local);
-    }
-    function attrConstant() {
-      this.setAttribute(name, value);
-    }
-    function attrConstantNS() {
-      this.setAttributeNS(name.space, name.local, value);
-    }
-    function attrFunction() {
-      var x = value.apply(this, arguments);
-      if (x == null) this.removeAttribute(name); else this.setAttribute(name, x);
-    }
-    function attrFunctionNS() {
-      var x = value.apply(this, arguments);
-      if (x == null) this.removeAttributeNS(name.space, name.local); else this.setAttributeNS(name.space, name.local, x);
-    }
-    return value == null ? name.local ? attrNullNS : attrNull : typeof value === "function" ? name.local ? attrFunctionNS : attrFunction : name.local ? attrConstantNS : attrConstant;
-  }
-  function d3_collapse(s) {
-    return s.trim().replace(/\s+/g, " ");
-  }
-  d3_selectionPrototype.classed = function(name, value) {
-    if (arguments.length < 2) {
-      if (typeof name === "string") {
-        var node = this.node(), n = (name = d3_selection_classes(name)).length, i = -1;
-        if (value = node.classList) {
-          while (++i < n) if (!value.contains(name[i])) return false;
-        } else {
-          value = node.getAttribute("class");
-          while (++i < n) if (!d3_selection_classedRe(name[i]).test(value)) return false;
-        }
-        return true;
-      }
-      for (value in name) this.each(d3_selection_classed(value, name[value]));
-      return this;
-    }
-    return this.each(d3_selection_classed(name, value));
-  };
-  function d3_selection_classedRe(name) {
-    return new RegExp("(?:^|\\s+)" + d3.requote(name) + "(?:\\s+|$)", "g");
-  }
-  function d3_selection_classes(name) {
-    return (name + "").trim().split(/^|\s+/);
-  }
-  function d3_selection_classed(name, value) {
-    name = d3_selection_classes(name).map(d3_selection_classedName);
-    var n = name.length;
-    function classedConstant() {
-      var i = -1;
-      while (++i < n) name[i](this, value);
-    }
-    function classedFunction() {
-      var i = -1, x = value.apply(this, arguments);
-      while (++i < n) name[i](this, x);
-    }
-    return typeof value === "function" ? classedFunction : classedConstant;
-  }
-  function d3_selection_classedName(name) {
-    var re = d3_selection_classedRe(name);
-    return function(node, value) {
-      if (c = node.classList) return value ? c.add(name) : c.remove(name);
-      var c = node.getAttribute("class") || "";
-      if (value) {
-        re.lastIndex = 0;
-        if (!re.test(c)) node.setAttribute("class", d3_collapse(c + " " + name));
+  }
+}
+
+var matcher$1 = matcher;
+
+var filterEvents = {};
+
+exports.event = null;
+
+if (typeof document !== "undefined") {
+  var element$1 = document.documentElement;
+  if (!("onmouseenter" in element$1)) {
+    filterEvents = {mouseenter: "mouseover", mouseleave: "mouseout"};
+  }
+}
+
+function filterContextListener(listener, index, group) {
+  listener = contextListener(listener, index, group);
+  return function(event) {
+    var related = event.relatedTarget;
+    if (!related || (related !== this && !(related.compareDocumentPosition(this) & 8))) {
+      listener.call(this, event);
+    }
+  };
+}
+
+function contextListener(listener, index, group) {
+  return function(event1) {
+    var event0 = exports.event; // Events can be reentrant (e.g., focus).
+    exports.event = event1;
+    try {
+      listener.call(this, this.__data__, index, group);
+    } finally {
+      exports.event = event0;
+    }
+  };
+}
+
+function parseTypenames$1(typenames) {
+  return typenames.trim().split(/^|\s+/).map(function(t) {
+    var name = "", i = t.indexOf(".");
+    if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);
+    return {type: t, name: name};
+  });
+}
+
+function onRemove(typename) {
+  return function() {
+    var on = this.__on;
+    if (!on) return;
+    for (var j = 0, i = -1, m = on.length, o; j < m; ++j) {
+      if (o = on[j], (!typename.type || o.type === typename.type) && o.name === typename.name) {
+        this.removeEventListener(o.type, o.listener, o.capture);
+      } else {
+        on[++i] = o;
+      }
+    }
+    if (++i) on.length = i;
+    else delete this.__on;
+  };
+}
+
+function onAdd(typename, value, capture) {
+  var wrap = filterEvents.hasOwnProperty(typename.type) ? filterContextListener : contextListener;
+  return function(d, i, group) {
+    var on = this.__on, o, listener = wrap(value, i, group);
+    if (on) for (var j = 0, m = on.length; j < m; ++j) {
+      if ((o = on[j]).type === typename.type && o.name === typename.name) {
+        this.removeEventListener(o.type, o.listener, o.capture);
+        this.addEventListener(o.type, o.listener = listener, o.capture = capture);
+        o.value = value;
+        return;
+      }
+    }
+    this.addEventListener(typename.type, listener, capture);
+    o = {type: typename.type, name: typename.name, value: value, listener: listener, capture: capture};
+    if (!on) this.__on = [o];
+    else on.push(o);
+  };
+}
+
+var selection_on = function(typename, value, capture) {
+  var typenames = parseTypenames$1(typename + ""), i, n = typenames.length, t;
+
+  if (arguments.length < 2) {
+    var on = this.node().__on;
+    if (on) for (var j = 0, m = on.length, o; j < m; ++j) {
+      for (i = 0, o = on[j]; i < n; ++i) {
+        if ((t = typenames[i]).type === o.type && t.name === o.name) {
+          return o.value;
+        }
+      }
+    }
+    return;
+  }
+
+  on = value ? onAdd : onRemove;
+  if (capture == null) capture = false;
+  for (i = 0; i < n; ++i) this.each(on(typenames[i], value, capture));
+  return this;
+};
+
+function customEvent(event1, listener, that, args) {
+  var event0 = exports.event;
+  event1.sourceEvent = exports.event;
+  exports.event = event1;
+  try {
+    return listener.apply(that, args);
+  } finally {
+    exports.event = event0;
+  }
+}
+
+var sourceEvent = function() {
+  var current = exports.event, source;
+  while (source = current.sourceEvent) current = source;
+  return current;
+};
+
+var point = function(node, event) {
+  var svg = node.ownerSVGElement || node;
+
+  if (svg.createSVGPoint) {
+    var point = svg.createSVGPoint();
+    point.x = event.clientX, point.y = event.clientY;
+    point = point.matrixTransform(node.getScreenCTM().inverse());
+    return [point.x, point.y];
+  }
+
+  var rect = node.getBoundingClientRect();
+  return [event.clientX - rect.left - node.clientLeft, event.clientY - rect.top - node.clientTop];
+};
+
+var mouse = function(node) {
+  var event = sourceEvent();
+  if (event.changedTouches) event = event.changedTouches[0];
+  return point(node, event);
+};
+
+function none() {}
+
+var selector = function(selector) {
+  return selector == null ? none : function() {
+    return this.querySelector(selector);
+  };
+};
+
+var selection_select = function(select) {
+  if (typeof select !== "function") select = selector(select);
+
+  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
+    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
+      if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {
+        if ("__data__" in node) subnode.__data__ = node.__data__;
+        subgroup[i] = subnode;
+      }
+    }
+  }
+
+  return new Selection(subgroups, this._parents);
+};
+
+function empty$1() {
+  return [];
+}
+
+var selectorAll = function(selector) {
+  return selector == null ? empty$1 : function() {
+    return this.querySelectorAll(selector);
+  };
+};
+
+var selection_selectAll = function(select) {
+  if (typeof select !== "function") select = selectorAll(select);
+
+  for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
+    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
+      if (node = group[i]) {
+        subgroups.push(select.call(node, node.__data__, i, group));
+        parents.push(node);
+      }
+    }
+  }
+
+  return new Selection(subgroups, parents);
+};
+
+var selection_filter = function(match) {
+  if (typeof match !== "function") match = matcher$1(match);
+
+  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
+    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {
+      if ((node = group[i]) && match.call(node, node.__data__, i, group)) {
+        subgroup.push(node);
+      }
+    }
+  }
+
+  return new Selection(subgroups, this._parents);
+};
+
+var sparse = function(update) {
+  return new Array(update.length);
+};
+
+var selection_enter = function() {
+  return new Selection(this._enter || this._groups.map(sparse), this._parents);
+};
+
+function EnterNode(parent, datum) {
+  this.ownerDocument = parent.ownerDocument;
+  this.namespaceURI = parent.namespaceURI;
+  this._next = null;
+  this._parent = parent;
+  this.__data__ = datum;
+}
+
+EnterNode.prototype = {
+  constructor: EnterNode,
+  appendChild: function(child) { return this._parent.insertBefore(child, this._next); },
+  insertBefore: function(child, next) { return this._parent.insertBefore(child, next); },
+  querySelector: function(selector) { return this._parent.querySelector(selector); },
+  querySelectorAll: function(selector) { return this._parent.querySelectorAll(selector); }
+};
+
+var constant$1 = function(x) {
+  return function() {
+    return x;
+  };
+};
+
+var keyPrefix = "$"; // Protect against keys like “__proto__”.
+
+function bindIndex(parent, group, enter, update, exit, data) {
+  var i = 0,
+      node,
+      groupLength = group.length,
+      dataLength = data.length;
+
+  // Put any non-null nodes that fit into update.
+  // Put any null nodes into enter.
+  // Put any remaining data into enter.
+  for (; i < dataLength; ++i) {
+    if (node = group[i]) {
+      node.__data__ = data[i];
+      update[i] = node;
+    } else {
+      enter[i] = new EnterNode(parent, data[i]);
+    }
+  }
+
+  // Put any non-null nodes that don’t fit into exit.
+  for (; i < groupLength; ++i) {
+    if (node = group[i]) {
+      exit[i] = node;
+    }
+  }
+}
+
+function bindKey(parent, group, enter, update, exit, data, key) {
+  var i,
+      node,
+      nodeByKeyValue = {},
+      groupLength = group.length,
+      dataLength = data.length,
+      keyValues = new Array(groupLength),
+      keyValue;
+
+  // Compute the key for each node.
+  // If multiple nodes have the same key, the duplicates are added to exit.
+  for (i = 0; i < groupLength; ++i) {
+    if (node = group[i]) {
+      keyValues[i] = keyValue = keyPrefix + key.call(node, node.__data__, i, group);
+      if (keyValue in nodeByKeyValue) {
+        exit[i] = node;
       } else {
-        node.setAttribute("class", d3_collapse(c.replace(re, " ")));
-      }
+        nodeByKeyValue[keyValue] = node;
+      }
+    }
+  }
+
+  // Compute the key for each datum.
+  // If there a node associated with this key, join and add it to update.
+  // If there is not (or the key is a duplicate), add it to enter.
+  for (i = 0; i < dataLength; ++i) {
+    keyValue = keyPrefix + key.call(parent, data[i], i, data);
+    if (node = nodeByKeyValue[keyValue]) {
+      update[i] = node;
+      node.__data__ = data[i];
+      nodeByKeyValue[keyValue] = null;
+    } else {
+      enter[i] = new EnterNode(parent, data[i]);
+    }
+  }
+
+  // Add any remaining nodes that were not bound to data to exit.
+  for (i = 0; i < groupLength; ++i) {
+    if ((node = group[i]) && (nodeByKeyValue[keyValues[i]] === node)) {
+      exit[i] = node;
+    }
+  }
+}
+
+var selection_data = function(value, key) {
+  if (!value) {
+    data = new Array(this.size()), j = -1;
+    this.each(function(d) { data[++j] = d; });
+    return data;
+  }
+
+  var bind = key ? bindKey : bindIndex,
+      parents = this._parents,
+      groups = this._groups;
+
+  if (typeof value !== "function") value = constant$1(value);
+
+  for (var m = groups.length, update = new Array(m), enter = new Array(m), exit = new Array(m), j = 0; j < m; ++j) {
+    var parent = parents[j],
+        group = groups[j],
+        groupLength = group.length,
+        data = value.call(parent, parent && parent.__data__, j, parents),
+        dataLength = data.length,
+        enterGroup = enter[j] = new Array(dataLength),
+        updateGroup = update[j] = new Array(dataLength),
+        exitGroup = exit[j] = new Array(groupLength);
+
+    bind(parent, group, enterGroup, updateGroup, exitGroup, data, key);
+
+    // Now connect the enter nodes to their following update node, such that
+    // appendChild can insert the materialized enter node before this node,
+    // rather than at the end of the parent node.
+    for (var i0 = 0, i1 = 0, previous, next; i0 < dataLength; ++i0) {
+      if (previous = enterGroup[i0]) {
+        if (i0 >= i1) i1 = i0 + 1;
+        while (!(next = updateGroup[i1]) && ++i1 < dataLength);
+        previous._next = next || null;
+      }
+    }
+  }
+
+  update = new Selection(update, parents);
+  update._enter = enter;
+  update._exit = exit;
+  return update;
+};
+
+var selection_exit = function() {
+  return new Selection(this._exit || this._groups.map(sparse), this._parents);
+};
+
+var selection_merge = function(selection) {
+
+  for (var groups0 = this._groups, groups1 = selection._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
+    for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
+      if (node = group0[i] || group1[i]) {
+        merge[i] = node;
+      }
+    }
+  }
+
+  for (; j < m0; ++j) {
+    merges[j] = groups0[j];
+  }
+
+  return new Selection(merges, this._parents);
+};
+
+var selection_order = function() {
+
+  for (var groups = this._groups, j = -1, m = groups.length; ++j < m;) {
+    for (var group = groups[j], i = group.length - 1, next = group[i], node; --i >= 0;) {
+      if (node = group[i]) {
+        if (next && next !== node.nextSibling) next.parentNode.insertBefore(node, next);
+        next = node;
+      }
+    }
+  }
+
+  return this;
+};
+
+var selection_sort = function(compare) {
+  if (!compare) compare = ascending$1;
+
+  function compareNode(a, b) {
+    return a && b ? compare(a.__data__, b.__data__) : !a - !b;
+  }
+
+  for (var groups = this._groups, m = groups.length, sortgroups = new Array(m), j = 0; j < m; ++j) {
+    for (var group = groups[j], n = group.length, sortgroup = sortgroups[j] = new Array(n), node, i = 0; i < n; ++i) {
+      if (node = group[i]) {
+        sortgroup[i] = node;
+      }
+    }
+    sortgroup.sort(compareNode);
+  }
+
+  return new Selection(sortgroups, this._parents).order();
+};
+
+function ascending$1(a, b) {
+  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
+}
+
+var selection_call = function() {
+  var callback = arguments[0];
+  arguments[0] = this;
+  callback.apply(null, arguments);
+  return this;
+};
+
+var selection_nodes = function() {
+  var nodes = new Array(this.size()), i = -1;
+  this.each(function() { nodes[++i] = this; });
+  return nodes;
+};
+
+var selection_node = function() {
+
+  for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {
+    for (var group = groups[j], i = 0, n = group.length; i < n; ++i) {
+      var node = group[i];
+      if (node) return node;
+    }
+  }
+
+  return null;
+};
+
+var selection_size = function() {
+  var size = 0;
+  this.each(function() { ++size; });
+  return size;
+};
+
+var selection_empty = function() {
+  return !this.node();
+};
+
+var selection_each = function(callback) {
+
+  for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {
+    for (var group = groups[j], i = 0, n = group.length, node; i < n; ++i) {
+      if (node = group[i]) callback.call(node, node.__data__, i, group);
+    }
+  }
+
+  return this;
+};
+
+function attrRemove(name) {
+  return function() {
+    this.removeAttribute(name);
+  };
+}
+
+function attrRemoveNS(fullname) {
+  return function() {
+    this.removeAttributeNS(fullname.space, fullname.local);
+  };
+}
+
+function attrConstant(name, value) {
+  return function() {
+    this.setAttribute(name, value);
+  };
+}
+
+function attrConstantNS(fullname, value) {
+  return function() {
+    this.setAttributeNS(fullname.space, fullname.local, value);
+  };
+}
+
+function attrFunction(name, value) {
+  return function() {
+    var v = value.apply(this, arguments);
+    if (v == null) this.removeAttribute(name);
+    else this.setAttribute(name, v);
+  };
+}
+
+function attrFunctionNS(fullname, value) {
+  return function() {
+    var v = value.apply(this, arguments);
+    if (v == null) this.removeAttributeNS(fullname.space, fullname.local);
+    else this.setAttributeNS(fullname.space, fullname.local, v);
+  };
+}
+
+var selection_attr = function(name, value) {
+  var fullname = namespace(name);
+
+  if (arguments.length < 2) {
+    var node = this.node();
+    return fullname.local
+        ? node.getAttributeNS(fullname.space, fullname.local)
+        : node.getAttribute(fullname);
+  }
+
+  return this.each((value == null
+      ? (fullname.local ? attrRemoveNS : attrRemove) : (typeof value === "function"
+      ? (fullname.local ? attrFunctionNS : attrFunction)
+      : (fullname.local ? attrConstantNS : attrConstant)))(fullname, value));
+};
+
+var defaultView = function(node) {
+  return (node.ownerDocument && node.ownerDocument.defaultView) // node is a Node
+      || (node.document && node) // node is a Window
+      || node.defaultView; // node is a Document
+};
+
+function styleRemove(name) {
+  return function() {
+    this.style.removeProperty(name);
+  };
+}
+
+function styleConstant(name, value, priority) {
+  return function() {
+    this.style.setProperty(name, value, priority);
+  };
+}
+
+function styleFunction(name, value, priority) {
+  return function() {
+    var v = value.apply(this, arguments);
+    if (v == null) this.style.removeProperty(name);
+    else this.style.setProperty(name, v, priority);
+  };
+}
+
+var selection_style = function(name, value, priority) {
+  return arguments.length > 1
+      ? this.each((value == null
+            ? styleRemove : typeof value === "function"
+            ? styleFunction
+            : styleConstant)(name, value, priority == null ? "" : priority))
+      : styleValue(this.node(), name);
+};
+
+function styleValue(node, name) {
+  return node.style.getPropertyValue(name)
+      || defaultView(node).getComputedStyle(node, null).getPropertyValue(name);
+}
+
+function propertyRemove(name) {
+  return function() {
+    delete this[name];
+  };
+}
+
+function propertyConstant(name, value) {
+  return function() {
+    this[name] = value;
+  };
+}
+
+function propertyFunction(name, value) {
+  return function() {
+    var v = value.apply(this, arguments);
+    if (v == null) delete this[name];
+    else this[name] = v;
+  };
+}
+
+var selection_property = function(name, value) {
+  return arguments.length > 1
+      ? this.each((value == null
+          ? propertyRemove : typeof value === "function"
+          ? propertyFunction
+          : propertyConstant)(name, value))
+      : this.node()[name];
+};
+
+function classArray(string) {
+  return string.trim().split(/^|\s+/);
+}
+
+function classList(node) {
+  return node.classList || new ClassList(node);
+}
+
+function ClassList(node) {
+  this._node = node;
+  this._names = classArray(node.getAttribute("class") || "");
+}
+
+ClassList.prototype = {
+  add: function(name) {
+    var i = this._names.indexOf(name);
+    if (i < 0) {
+      this._names.push(name);
+      this._node.setAttribute("class", this._names.join(" "));
+    }
+  },
+  remove: function(name) {
+    var i = this._names.indexOf(name);
+    if (i >= 0) {
+      this._names.splice(i, 1);
+      this._node.setAttribute("class", this._names.join(" "));
+    }
+  },
+  contains: function(name) {
+    return this._names.indexOf(name) >= 0;
+  }
+};
+
+function classedAdd(node, names) {
+  var list = classList(node), i = -1, n = names.length;
+  while (++i < n) list.add(names[i]);
+}
+
+function classedRemove(node, names) {
+  var list = classList(node), i = -1, n = names.length;
+  while (++i < n) list.remove(names[i]);
+}
+
+function classedTrue(names) {
+  return function() {
+    classedAdd(this, names);
+  };
+}
+
+function classedFalse(names) {
+  return function() {
+    classedRemove(this, names);
+  };
+}
+
+function classedFunction(names, value) {
+  return function() {
+    (value.apply(this, arguments) ? classedAdd : classedRemove)(this, names);
+  };
+}
+
+var selection_classed = function(name, value) {
+  var names = classArray(name + "");
+
+  if (arguments.length < 2) {
+    var list = classList(this.node()), i = -1, n = names.length;
+    while (++i < n) if (!list.contains(names[i])) return false;
+    return true;
+  }
+
+  return this.each((typeof value === "function"
+      ? classedFunction : value
+      ? classedTrue
+      : classedFalse)(names, value));
+};
+
+function textRemove() {
+  this.textContent = "";
+}
+
+function textConstant(value) {
+  return function() {
+    this.textContent = value;
+  };
+}
+
+function textFunction(value) {
+  return function() {
+    var v = value.apply(this, arguments);
+    this.textContent = v == null ? "" : v;
+  };
+}
+
+var selection_text = function(value) {
+  return arguments.length
+      ? this.each(value == null
+          ? textRemove : (typeof value === "function"
+          ? textFunction
+          : textConstant)(value))
+      : this.node().textContent;
+};
+
+function htmlRemove() {
+  this.innerHTML = "";
+}
+
+function htmlConstant(value) {
+  return function() {
+    this.innerHTML = value;
+  };
+}
+
+function htmlFunction(value) {
+  return function() {
+    var v = value.apply(this, arguments);
+    this.innerHTML = v == null ? "" : v;
+  };
+}
+
+var selection_html = function(value) {
+  return arguments.length
+      ? this.each(value == null
+          ? htmlRemove : (typeof value === "function"
+          ? htmlFunction
+          : htmlConstant)(value))
+      : this.node().innerHTML;
+};
+
+function raise() {
+  if (this.nextSibling) this.parentNode.appendChild(this);
+}
+
+var selection_raise = function() {
+  return this.each(raise);
+};
+
+function lower() {
+  if (this.previousSibling) this.parentNode.insertBefore(this, this.parentNode.firstChild);
+}
+
+var selection_lower = function() {
+  return this.each(lower);
+};
+
+var selection_append = function(name) {
+  var create = typeof name === "function" ? name : creator(name);
+  return this.select(function() {
+    return this.appendChild(create.apply(this, arguments));
+  });
+};
+
+function constantNull() {
+  return null;
+}
+
+var selection_insert = function(name, before) {
+  var create = typeof name === "function" ? name : creator(name),
+      select = before == null ? constantNull : typeof before === "function" ? before : selector(before);
+  return this.select(function() {
+    return this.insertBefore(create.apply(this, arguments), select.apply(this, arguments) || null);
+  });
+};
+
+function remove() {
+  var parent = this.parentNode;
+  if (parent) parent.removeChild(this);
+}
+
+var selection_remove = function() {
+  return this.each(remove);
+};
+
+var selection_datum = function(value) {
+  return arguments.length
+      ? this.property("__data__", value)
+      : this.node().__data__;
+};
+
+function dispatchEvent(node, type, params) {
+  var window = defaultView(node),
+      event = window.CustomEvent;
+
+  if (typeof event === "function") {
+    event = new event(type, params);
+  } else {
+    event = window.document.createEvent("Event");
+    if (params) event.initEvent(type, params.bubbles, params.cancelable), event.detail = params.detail;
+    else event.initEvent(type, false, false);
+  }
+
+  node.dispatchEvent(event);
+}
+
+function dispatchConstant(type, params) {
+  return function() {
+    return dispatchEvent(this, type, params);
+  };
+}
+
+function dispatchFunction(type, params) {
+  return function() {
+    return dispatchEvent(this, type, params.apply(this, arguments));
+  };
+}
+
+var selection_dispatch = function(type, params) {
+  return this.each((typeof params === "function"
+      ? dispatchFunction
+      : dispatchConstant)(type, params));
+};
+
+var root = [null];
+
+function Selection(groups, parents) {
+  this._groups = groups;
+  this._parents = parents;
+}
+
+function selection() {
+  return new Selection([[document.documentElement]], root);
+}
+
+Selection.prototype = selection.prototype = {
+  constructor: Selection,
+  select: selection_select,
+  selectAll: selection_selectAll,
+  filter: selection_filter,
+  data: selection_data,
+  enter: selection_enter,
+  exit: selection_exit,
+  merge: selection_merge,
+  order: selection_order,
+  sort: selection_sort,
+  call: selection_call,
+  nodes: selection_nodes,
+  node: selection_node,
+  size: selection_size,
+  empty: selection_empty,
+  each: selection_each,
+  attr: selection_attr,
+  style: selection_style,
+  property: selection_property,
+  classed: selection_classed,
+  text: selection_text,
+  html: selection_html,
+  raise: selection_raise,
+  lower: selection_lower,
+  append: selection_append,
+  insert: selection_insert,
+  remove: selection_remove,
+  datum: selection_datum,
+  on: selection_on,
+  dispatch: selection_dispatch
+};
+
+var select = function(selector) {
+  return typeof selector === "string"
+      ? new Selection([[document.querySelector(selector)]], [document.documentElement])
+      : new Selection([[selector]], root);
+};
+
+var selectAll = function(selector) {
+  return typeof selector === "string"
+      ? new Selection([document.querySelectorAll(selector)], [document.documentElement])
+      : new Selection([selector == null ? [] : selector], root);
+};
+
+var touch = function(node, touches, identifier) {
+  if (arguments.length < 3) identifier = touches, touches = sourceEvent().changedTouches;
+
+  for (var i = 0, n = touches ? touches.length : 0, touch; i < n; ++i) {
+    if ((touch = touches[i]).identifier === identifier) {
+      return point(node, touch);
+    }
+  }
+
+  return null;
+};
+
+var touches = function(node, touches) {
+  if (touches == null) touches = sourceEvent().touches;
+
+  for (var i = 0, n = touches ? touches.length : 0, points = new Array(n); i < n; ++i) {
+    points[i] = point(node, touches[i]);
+  }
+
+  return points;
+};
+
+function nopropagation() {
+  exports.event.stopImmediatePropagation();
+}
+
+var noevent = function() {
+  exports.event.preventDefault();
+  exports.event.stopImmediatePropagation();
+};
+
+var dragDisable = function(view) {
+  var root = view.document.documentElement,
+      selection$$1 = select(view).on("dragstart.drag", noevent, true);
+  if ("onselectstart" in root) {
+    selection$$1.on("selectstart.drag", noevent, true);
+  } else {
+    root.__noselect = root.style.MozUserSelect;
+    root.style.MozUserSelect = "none";
+  }
+};
+
+function yesdrag(view, noclick) {
+  var root = view.document.documentElement,
+      selection$$1 = select(view).on("dragstart.drag", null);
+  if (noclick) {
+    selection$$1.on("click.drag", noevent, true);
+    setTimeout(function() { selection$$1.on("click.drag", null); }, 0);
+  }
+  if ("onselectstart" in root) {
+    selection$$1.on("selectstart.drag", null);
+  } else {
+    root.style.MozUserSelect = root.__noselect;
+    delete root.__noselect;
+  }
+}
+
+var constant$2 = function(x) {
+  return function() {
+    return x;
+  };
+};
+
+function DragEvent(target, type, subject, id, active, x, y, dx, dy, dispatch) {
+  this.target = target;
+  this.type = type;
+  this.subject = subject;
+  this.identifier = id;
+  this.active = active;
+  this.x = x;
+  this.y = y;
+  this.dx = dx;
+  this.dy = dy;
+  this._ = dispatch;
+}
+
+DragEvent.prototype.on = function() {
+  var value = this._.on.apply(this._, arguments);
+  return value === this._ ? this : value;
+};
+
+// Ignore right-click, since that should open the context menu.
+function defaultFilter$1() {
+  return !exports.event.button;
+}
+
+function defaultContainer() {
+  return this.parentNode;
+}
+
+function defaultSubject(d) {
+  return d == null ? {x: exports.event.x, y: exports.event.y} : d;
+}
+
+var drag = function() {
+  var filter = defaultFilter$1,
+      container = defaultContainer,
+      subject = defaultSubject,
+      gestures = {},
+      listeners = dispatch("start", "drag", "end"),
+      active = 0,
+      mousedownx,
+      mousedowny,
+      mousemoving,
+      touchending,
+      clickDistance2 = 0;
+
+  function drag(selection$$1) {
+    selection$$1
+        .on("mousedown.drag", mousedowned)
+        .on("touchstart.drag", touchstarted)
+        .on("touchmove.drag", touchmoved)
+        .on("touchend.drag touchcancel.drag", touchended)
+        .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
+  }
+
+  function mousedowned() {
+    if (touchending || !filter.apply(this, arguments)) return;
+    var gesture = beforestart("mouse", container.apply(this, arguments), mouse, this, arguments);
+    if (!gesture) return;
+    select(exports.event.view).on("mousemove.drag", mousemoved, true).on("mouseup.drag", mouseupped, true);
+    dragDisable(exports.event.view);
+    nopropagation();
+    mousemoving = false;
+    mousedownx = exports.event.clientX;
+    mousedowny = exports.event.clientY;
+    gesture("start");
+  }
+
+  function mousemoved() {
+    noevent();
+    if (!mousemoving) {
+      var dx = exports.event.clientX - mousedownx, dy = exports.event.clientY - mousedowny;
+      mousemoving = dx * dx + dy * dy > clickDistance2;
+    }
+    gestures.mouse("drag");
+  }
+
+  function mouseupped() {
+    select(exports.event.view).on("mousemove.drag mouseup.drag", null);
+    yesdrag(exports.event.view, mousemoving);
+    noevent();
+    gestures.mouse("end");
+  }
+
+  function touchstarted() {
+    if (!filter.apply(this, arguments)) return;
+    var touches$$1 = exports.event.changedTouches,
+        c = container.apply(this, arguments),
+        n = touches$$1.length, i, gesture;
+
+    for (i = 0; i < n; ++i) {
+      if (gesture = beforestart(touches$$1[i].identifier, c, touch, this, arguments)) {
+        nopropagation();
+        gesture("start");
+      }
+    }
+  }
+
+  function touchmoved() {
+    var touches$$1 = exports.event.changedTouches,
+        n = touches$$1.length, i, gesture;
+
+    for (i = 0; i < n; ++i) {
+      if (gesture = gestures[touches$$1[i].identifier]) {
+        noevent();
+        gesture("drag");
+      }
+    }
+  }
+
+  function touchended() {
+    var touches$$1 = exports.event.changedTouches,
+        n = touches$$1.length, i, gesture;
+
+    if (touchending) clearTimeout(touchending);
+    touchending = setTimeout(function() { touchending = null; }, 500); // Ghost clicks are delayed!
+    for (i = 0; i < n; ++i) {
+      if (gesture = gestures[touches$$1[i].identifier]) {
+        nopropagation();
+        gesture("end");
+      }
+    }
+  }
+
+  function beforestart(id, container, point, that, args) {
+    var p = point(container, id), s, dx, dy,
+        sublisteners = listeners.copy();
+
+    if (!customEvent(new DragEvent(drag, "beforestart", s, id, active, p[0], p[1], 0, 0, sublisteners), function() {
+      if ((exports.event.subject = s = subject.apply(that, args)) == null) return false;
+      dx = s.x - p[0] || 0;
+      dy = s.y - p[1] || 0;
+      return true;
+    })) return;
+
+    return function gesture(type) {
+      var p0 = p, n;
+      switch (type) {
+        case "start": gestures[id] = gesture, n = active++; break;
+        case "end": delete gestures[id], --active; // nobreak
+        case "drag": p = point(container, id), n = active; break;
+      }
+      customEvent(new DragEvent(drag, type, s, id, n, p[0] + dx, p[1] + dy, p[0] - p0[0], p[1] - p0[1], sublisteners), sublisteners.apply, sublisteners, [type, that, args]);
     };
   }
-  d3_selectionPrototype.style = function(name, value, priority) {
-    var n = arguments.length;
-    if (n < 3) {
-      if (typeof name !== "string") {
-        if (n < 2) value = "";
-        for (priority in name) this.each(d3_selection_style(priority, name[priority], value));
-        return this;
-      }
-      if (n < 2) return d3_window.getComputedStyle(this.node(), null).getPropertyValue(name);
-      priority = "";
-    }
-    return this.each(d3_selection_style(name, value, priority));
-  };
-  function d3_selection_style(name, value, priority) {
-    function styleNull() {
-      this.style.removeProperty(name);
-    }
-    function styleConstant() {
-      this.style.setProperty(name, value, priority);
-    }
-    function styleFunction() {
-      var x = value.apply(this, arguments);
-      if (x == null) this.style.removeProperty(name); else this.style.setProperty(name, x, priority);
-    }
-    return value == null ? styleNull : typeof value === "function" ? styleFunction : styleConstant;
-  }
-  d3_selectionPrototype.property = function(name, value) {
-    if (arguments.length < 2) {
-      if (typeof name === "string") return this.node()[name];
-      for (value in name) this.each(d3_selection_property(value, name[value]));
-      return this;
-    }
-    return this.each(d3_selection_property(name, value));
-  };
-  function d3_selection_property(name, value) {
-    function propertyNull() {
-      delete this[name];
-    }
-    function propertyConstant() {
-      this[name] = value;
-    }
-    function propertyFunction() {
-      var x = value.apply(this, arguments);
-      if (x == null) delete this[name]; else this[name] = x;
-    }
-    return value == null ? propertyNull : typeof value === "function" ? propertyFunction : propertyConstant;
-  }
-  d3_selectionPrototype.text = function(value) {
-    return arguments.length ? this.each(typeof value === "function" ? function() {
-      var v = value.apply(this, arguments);
-      this.textContent = v == null ? "" : v;
-    } : value == null ? function() {
-      this.textContent = "";
-    } : function() {
-      this.textContent = value;
-    }) : this.node().textContent;
-  };
-  d3_selectionPrototype.html = function(value) {
-    return arguments.length ? this.each(typeof value === "function" ? function() {
-      var v = value.apply(this, arguments);
-      this.innerHTML = v == null ? "" : v;
-    } : value == null ? function() {
-      this.innerHTML = "";
-    } : function() {
-      this.innerHTML = value;
-    }) : this.node().innerHTML;
-  };
-  d3_selectionPrototype.append = function(name) {
-    name = d3_selection_creator(name);
-    return this.select(function() {
-      return this.appendChild(name.apply(this, arguments));
-    });
-  };
-  function d3_selection_creator(name) {
-    return typeof name === "function" ? name : (name = d3.ns.qualify(name)).local ? function() {
-      return this.ownerDocument.createElementNS(name.space, name.local);
-    } : function() {
-      return this.ownerDocument.createElementNS(this.namespaceURI, name);
+
+  drag.filter = function(_) {
+    return arguments.length ? (filter = typeof _ === "function" ? _ : constant$2(!!_), drag) : filter;
+  };
+
+  drag.container = function(_) {
+    return arguments.length ? (container = typeof _ === "function" ? _ : constant$2(_), drag) : container;
+  };
+
+  drag.subject = function(_) {
+    return arguments.length ? (subject = typeof _ === "function" ? _ : constant$2(_), drag) : subject;
+  };
+
+  drag.on = function() {
+    var value = listeners.on.apply(listeners, arguments);
+    return value === listeners ? drag : value;
+  };
+
+  drag.clickDistance = function(_) {
+    return arguments.length ? (clickDistance2 = (_ = +_) * _, drag) : Math.sqrt(clickDistance2);
+  };
+
+  return drag;
+};
+
+var define = function(constructor, factory, prototype) {
+  constructor.prototype = factory.prototype = prototype;
+  prototype.constructor = constructor;
+};
+
+function extend(parent, definition) {
+  var prototype = Object.create(parent.prototype);
+  for (var key in definition) prototype[key] = definition[key];
+  return prototype;
+}
+
+function Color() {}
+
+var darker = 0.7;
+var brighter = 1 / darker;
+
+var reI = "\\s*([+-]?\\d+)\\s*";
+var reN = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)\\s*";
+var reP = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)%\\s*";
+var reHex3 = /^#([0-9a-f]{3})$/;
+var reHex6 = /^#([0-9a-f]{6})$/;
+var reRgbInteger = new RegExp("^rgb\\(" + [reI, reI, reI] + "\\)$");
+var reRgbPercent = new RegExp("^rgb\\(" + [reP, reP, reP] + "\\)$");
+var reRgbaInteger = new RegExp("^rgba\\(" + [reI, reI, reI, reN] + "\\)$");
+var reRgbaPercent = new RegExp("^rgba\\(" + [reP, reP, reP, reN] + "\\)$");
+var reHslPercent = new RegExp("^hsl\\(" + [reN, reP, reP] + "\\)$");
+var reHslaPercent = new RegExp("^hsla\\(" + [reN, reP, reP, reN] + "\\)$");
+
+var named = {
+  aliceblue: 0xf0f8ff,
+  antiquewhite: 0xfaebd7,
+  aqua: 0x00ffff,
+  aquamarine: 0x7fffd4,
+  azure: 0xf0ffff,
+  beige: 0xf5f5dc,
+  bisque: 0xffe4c4,
+  black: 0x000000,
+  blanchedalmond: 0xffebcd,
+  blue: 0x0000ff,
+  blueviolet: 0x8a2be2,
+  brown: 0xa52a2a,
+  burlywood: 0xdeb887,
+  cadetblue: 0x5f9ea0,
+  chartreuse: 0x7fff00,
+  chocolate: 0xd2691e,
+  coral: 0xff7f50,
+  cornflowerblue: 0x6495ed,
+  cornsilk: 0xfff8dc,
+  crimson: 0xdc143c,
+  cyan: 0x00ffff,
+  darkblue: 0x00008b,
+  darkcyan: 0x008b8b,
+  darkgoldenrod: 0xb8860b,
+  darkgray: 0xa9a9a9,
+  darkgreen: 0x006400,
+  darkgrey: 0xa9a9a9,
+  darkkhaki: 0xbdb76b,
+  darkmagenta: 0x8b008b,
+  darkolivegreen: 0x556b2f,
+  darkorange: 0xff8c00,
+  darkorchid: 0x9932cc,
+  darkred: 0x8b0000,
+  darksalmon: 0xe9967a,
+  darkseagreen: 0x8fbc8f,
+  darkslateblue: 0x483d8b,
+  darkslategray: 0x2f4f4f,
+  darkslategrey: 0x2f4f4f,
+  darkturquoise: 0x00ced1,
+  darkviolet: 0x9400d3,
+  deeppink: 0xff1493,
+  deepskyblue: 0x00bfff,
+  dimgray: 0x696969,
+  dimgrey: 0x696969,
+  dodgerblue: 0x1e90ff,
+  firebrick: 0xb22222,
+  floralwhite: 0xfffaf0,
+  forestgreen: 0x228b22,
+  fuchsia: 0xff00ff,
+  gainsboro: 0xdcdcdc,
+  ghostwhite: 0xf8f8ff,
+  gold: 0xffd700,
+  goldenrod: 0xdaa520,
+  gray: 0x808080,
+  green: 0x008000,
+  greenyellow: 0xadff2f,
+  grey: 0x808080,
+  honeydew: 0xf0fff0,
+  hotpink: 0xff69b4,
+  indianred: 0xcd5c5c,
+  indigo: 0x4b0082,
+  ivory: 0xfffff0,
+  khaki: 0xf0e68c,
+  lavender: 0xe6e6fa,
+  lavenderblush: 0xfff0f5,
+  lawngreen: 0x7cfc00,
+  lemonchiffon: 0xfffacd,
+  lightblue: 0xadd8e6,
+  lightcoral: 0xf08080,
+  lightcyan: 0xe0ffff,
+  lightgoldenrodyellow: 0xfafad2,
+  lightgray: 0xd3d3d3,
+  lightgreen: 0x90ee90,
+  lightgrey: 0xd3d3d3,
+  lightpink: 0xffb6c1,
+  lightsalmon: 0xffa07a,
+  lightseagreen: 0x20b2aa,
+  lightskyblue: 0x87cefa,
+  lightslategray: 0x778899,
+  lightslategrey: 0x778899,
+  lightsteelblue: 0xb0c4de,
+  lightyellow: 0xffffe0,
+  lime: 0x00ff00,
+  limegreen: 0x32cd32,
+  linen: 0xfaf0e6,
+  magenta: 0xff00ff,
+  maroon: 0x800000,
+  mediumaquamarine: 0x66cdaa,
+  mediumblue: 0x0000cd,
+  mediumorchid: 0xba55d3,
+  mediumpurple: 0x9370db,
+  mediumseagreen: 0x3cb371,
+  mediumslateblue: 0x7b68ee,
+  mediumspringgreen: 0x00fa9a,
+  mediumturquoise: 0x48d1cc,
+  mediumvioletred: 0xc71585,
+  midnightblue: 0x191970,
+  mintcream: 0xf5fffa,
+  mistyrose: 0xffe4e1,
+  moccasin: 0xffe4b5,
+  navajowhite: 0xffdead,
+  navy: 0x000080,
+  oldlace: 0xfdf5e6,
+  olive: 0x808000,
+  olivedrab: 0x6b8e23,
+  orange: 0xffa500,
+  orangered: 0xff4500,
+  orchid: 0xda70d6,
+  palegoldenrod: 0xeee8aa,
+  palegreen: 0x98fb98,
+  paleturquoise: 0xafeeee,
+  palevioletred: 0xdb7093,
+  papayawhip: 0xffefd5,
+  peachpuff: 0xffdab9,
+  peru: 0xcd853f,
+  pink: 0xffc0cb,
+  plum: 0xdda0dd,
+  powderblue: 0xb0e0e6,
+  purple: 0x800080,
+  rebeccapurple: 0x663399,
+  red: 0xff0000,
+  rosybrown: 0xbc8f8f,
+  royalblue: 0x4169e1,
+  saddlebrown: 0x8b4513,
+  salmon: 0xfa8072,
+  sandybrown: 0xf4a460,
+  seagreen: 0x2e8b57,
+  seashell: 0xfff5ee,
+  sienna: 0xa0522d,
+  silver: 0xc0c0c0,
+  skyblue: 0x87ceeb,
+  slateblue: 0x6a5acd,
+  slategray: 0x708090,
+  slategrey: 0x708090,
+  snow: 0xfffafa,
+  springgreen: 0x00ff7f,
+  steelblue: 0x4682b4,
+  tan: 0xd2b48c,
+  teal: 0x008080,
+  thistle: 0xd8bfd8,
+  tomato: 0xff6347,
+  turquoise: 0x40e0d0,
+  violet: 0xee82ee,
+  wheat: 0xf5deb3,
+  white: 0xffffff,
+  whitesmoke: 0xf5f5f5,
+  yellow: 0xffff00,
+  yellowgreen: 0x9acd32
+};
+
+define(Color, color, {
+  displayable: function() {
+    return this.rgb().displayable();
+  },
+  toString: function() {
+    return this.rgb() + "";
+  }
+});
+
+function color(format) {
+  var m;
+  format = (format + "").trim().toLowerCase();
+  return (m = reHex3.exec(format)) ? (m = parseInt(m[1], 16), new Rgb((m >> 8 & 0xf) | (m >> 4 & 0x0f0), (m >> 4 & 0xf) | (m & 0xf0), ((m & 0xf) << 4) | (m & 0xf), 1)) // #f00
+      : (m = reHex6.exec(format)) ? rgbn(parseInt(m[1], 16)) // #ff0000
+      : (m = reRgbInteger.exec(format)) ? new Rgb(m[1], m[2], m[3], 1) // rgb(255, 0, 0)
+      : (m = reRgbPercent.exec(format)) ? new Rgb(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, 1) // rgb(100%, 0%, 0%)
+      : (m = reRgbaInteger.exec(format)) ? rgba(m[1], m[2], m[3], m[4]) // rgba(255, 0, 0, 1)
+      : (m = reRgbaPercent.exec(format)) ? rgba(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, m[4]) // rgb(100%, 0%, 0%, 1)
+      : (m = reHslPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, 1) // hsl(120, 50%, 50%)
+      : (m = reHslaPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, m[4]) // hsla(120, 50%, 50%, 1)
+      : named.hasOwnProperty(format) ? rgbn(named[format])
+      : format === "transparent" ? new Rgb(NaN, NaN, NaN, 0)
+      : null;
+}
+
+function rgbn(n) {
+  return new Rgb(n >> 16 & 0xff, n >> 8 & 0xff, n & 0xff, 1);
+}
+
+function rgba(r, g, b, a) {
+  if (a <= 0) r = g = b = NaN;
+  return new Rgb(r, g, b, a);
+}
+
+function rgbConvert(o) {
+  if (!(o instanceof Color)) o = color(o);
+  if (!o) return new Rgb;
+  o = o.rgb();
+  return new Rgb(o.r, o.g, o.b, o.opacity);
+}
+
+function rgb(r, g, b, opacity) {
+  return arguments.length === 1 ? rgbConvert(r) : new Rgb(r, g, b, opacity == null ? 1 : opacity);
+}
+
+function Rgb(r, g, b, opacity) {
+  this.r = +r;
+  this.g = +g;
+  this.b = +b;
+  this.opacity = +opacity;
+}
+
+define(Rgb, rgb, extend(Color, {
+  brighter: function(k) {
+    k = k == null ? brighter : Math.pow(brighter, k);
+    return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
+  },
+  darker: function(k) {
+    k = k == null ? darker : Math.pow(darker, k);
+    return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
+  },
+  rgb: function() {
+    return this;
+  },
+  displayable: function() {
+    return (0 <= this.r && this.r <= 255)
+        && (0 <= this.g && this.g <= 255)
+        && (0 <= this.b && this.b <= 255)
+        && (0 <= this.opacity && this.opacity <= 1);
+  },
+  toString: function() {
+    var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));
+    return (a === 1 ? "rgb(" : "rgba(")
+        + Math.max(0, Math.min(255, Math.round(this.r) || 0)) + ", "
+        + Math.max(0, Math.min(255, Math.round(this.g) || 0)) + ", "
+        + Math.max(0, Math.min(255, Math.round(this.b) || 0))
+        + (a === 1 ? ")" : ", " + a + ")");
+  }
+}));
+
+function hsla(h, s, l, a) {
+  if (a <= 0) h = s = l = NaN;
+  else if (l <= 0 || l >= 1) h = s = NaN;
+  else if (s <= 0) h = NaN;
+  return new Hsl(h, s, l, a);
+}
+
+function hslConvert(o) {
+  if (o instanceof Hsl) return new Hsl(o.h, o.s, o.l, o.opacity);
+  if (!(o instanceof Color)) o = color(o);
+  if (!o) return new Hsl;
+  if (o instanceof Hsl) return o;
+  o = o.rgb();
+  var r = o.r / 255,
+      g = o.g / 255,
+      b = o.b / 255,
+      min = Math.min(r, g, b),
+      max = Math.max(r, g, b),
+      h = NaN,
+      s = max - min,
+      l = (max + min) / 2;
+  if (s) {
+    if (r === max) h = (g - b) / s + (g < b) * 6;
+    else if (g === max) h = (b - r) / s + 2;
+    else h = (r - g) / s + 4;
+    s /= l < 0.5 ? max + min : 2 - max - min;
+    h *= 60;
+  } else {
+    s = l > 0 && l < 1 ? 0 : h;
+  }
+  return new Hsl(h, s, l, o.opacity);
+}
+
+function hsl(h, s, l, opacity) {
+  return arguments.length === 1 ? hslConvert(h) : new Hsl(h, s, l, opacity == null ? 1 : opacity);
+}
+
+function Hsl(h, s, l, opacity) {
+  this.h = +h;
+  this.s = +s;
+  this.l = +l;
+  this.opacity = +opacity;
+}
+
+define(Hsl, hsl, extend(Color, {
+  brighter: function(k) {
+    k = k == null ? brighter : Math.pow(brighter, k);
+    return new Hsl(this.h, this.s, this.l * k, this.opacity);
+  },
+  darker: function(k) {
+    k = k == null ? darker : Math.pow(darker, k);
+    return new Hsl(this.h, this.s, this.l * k, this.opacity);
+  },
+  rgb: function() {
+    var h = this.h % 360 + (this.h < 0) * 360,
+        s = isNaN(h) || isNaN(this.s) ? 0 : this.s,
+        l = this.l,
+        m2 = l + (l < 0.5 ? l : 1 - l) * s,
+        m1 = 2 * l - m2;
+    return new Rgb(
+      hsl2rgb(h >= 240 ? h - 240 : h + 120, m1, m2),
+      hsl2rgb(h, m1, m2),
+      hsl2rgb(h < 120 ? h + 240 : h - 120, m1, m2),
+      this.opacity
+    );
+  },
+  displayable: function() {
+    return (0 <= this.s && this.s <= 1 || isNaN(this.s))
+        && (0 <= this.l && this.l <= 1)
+        && (0 <= this.opacity && this.opacity <= 1);
+  }
+}));
+
+/* From FvD 13.37, CSS Color Module Level 3 */
+function hsl2rgb(h, m1, m2) {
+  return (h < 60 ? m1 + (m2 - m1) * h / 60
+      : h < 180 ? m2
+      : h < 240 ? m1 + (m2 - m1) * (240 - h) / 60
+      : m1) * 255;
+}
+
+var deg2rad = Math.PI / 180;
+var rad2deg = 180 / Math.PI;
+
+var Kn = 18;
+var Xn = 0.950470;
+var Yn = 1;
+var Zn = 1.088830;
+var t0 = 4 / 29;
+var t1 = 6 / 29;
+var t2 = 3 * t1 * t1;
+var t3 = t1 * t1 * t1;
+
+function labConvert(o) {
+  if (o instanceof Lab) return new Lab(o.l, o.a, o.b, o.opacity);
+  if (o instanceof Hcl) {
+    var h = o.h * deg2rad;
+    return new Lab(o.l, Math.cos(h) * o.c, Math.sin(h) * o.c, o.opacity);
+  }
+  if (!(o instanceof Rgb)) o = rgbConvert(o);
+  var b = rgb2xyz(o.r),
+      a = rgb2xyz(o.g),
+      l = rgb2xyz(o.b),
+      x = xyz2lab((0.4124564 * b + 0.3575761 * a + 0.1804375 * l) / Xn),
+      y = xyz2lab((0.2126729 * b + 0.7151522 * a + 0.0721750 * l) / Yn),
+      z = xyz2lab((0.0193339 * b + 0.1191920 * a + 0.9503041 * l) / Zn);
+  return new Lab(116 * y - 16, 500 * (x - y), 200 * (y - z), o.opacity);
+}
+
+function lab(l, a, b, opacity) {
+  return arguments.length === 1 ? labConvert(l) : new Lab(l, a, b, opacity == null ? 1 : opacity);
+}
+
+function Lab(l, a, b, opacity) {
+  this.l = +l;
+  this.a = +a;
+  this.b = +b;
+  this.opacity = +opacity;
+}
+
+define(Lab, lab, extend(Color, {
+  brighter: function(k) {
+    return new Lab(this.l + Kn * (k == null ? 1 : k), this.a, this.b, this.opacity);
+  },
+  darker: function(k) {
+    return new Lab(this.l - Kn * (k == null ? 1 : k), this.a, this.b, this.opacity);
+  },
+  rgb: function() {
+    var y = (this.l + 16) / 116,
+        x = isNaN(this.a) ? y : y + this.a / 500,
+        z = isNaN(this.b) ? y : y - this.b / 200;
+    y = Yn * lab2xyz(y);
+    x = Xn * lab2xyz(x);
+    z = Zn * lab2xyz(z);
+    return new Rgb(
+      xyz2rgb( 3.2404542 * x - 1.5371385 * y - 0.4985314 * z), // D65 -> sRGB
+      xyz2rgb(-0.9692660 * x + 1.8760108 * y + 0.0415560 * z),
+      xyz2rgb( 0.0556434 * x - 0.2040259 * y + 1.0572252 * z),
+      this.opacity
+    );
+  }
+}));
+
+function xyz2lab(t) {
+  return t > t3 ? Math.pow(t, 1 / 3) : t / t2 + t0;
+}
+
+function lab2xyz(t) {
+  return t > t1 ? t * t * t : t2 * (t - t0);
+}
+
+function xyz2rgb(x) {
+  return 255 * (x <= 0.0031308 ? 12.92 * x : 1.055 * Math.pow(x, 1 / 2.4) - 0.055);
+}
+
+function rgb2xyz(x) {
+  return (x /= 255) <= 0.04045 ? x / 12.92 : Math.pow((x + 0.055) / 1.055, 2.4);
+}
+
+function hclConvert(o) {
+  if (o instanceof Hcl) return new Hcl(o.h, o.c, o.l, o.opacity);
+  if (!(o instanceof Lab)) o = labConvert(o);
+  var h = Math.atan2(o.b, o.a) * rad2deg;
+  return new Hcl(h < 0 ? h + 360 : h, Math.sqrt(o.a * o.a + o.b * o.b), o.l, o.opacity);
+}
+
+function hcl(h, c, l, opacity) {
+  return arguments.length === 1 ? hclConvert(h) : new Hcl(h, c, l, opacity == null ? 1 : opacity);
+}
+
+function Hcl(h, c, l, opacity) {
+  this.h = +h;
+  this.c = +c;
+  this.l = +l;
+  this.opacity = +opacity;
+}
+
+define(Hcl, hcl, extend(Color, {
+  brighter: function(k) {
+    return new Hcl(this.h, this.c, this.l + Kn * (k == null ? 1 : k), this.opacity);
+  },
+  darker: function(k) {
+    return new Hcl(this.h, this.c, this.l - Kn * (k == null ? 1 : k), this.opacity);
+  },
+  rgb: function() {
+    return labConvert(this).rgb();
+  }
+}));
+
+var A = -0.14861;
+var B = +1.78277;
+var C = -0.29227;
+var D = -0.90649;
+var E = +1.97294;
+var ED = E * D;
+var EB = E * B;
+var BC_DA = B * C - D * A;
+
+function cubehelixConvert(o) {
+  if (o instanceof Cubehelix) return new Cubehelix(o.h, o.s, o.l, o.opacity);
+  if (!(o instanceof Rgb)) o = rgbConvert(o);
+  var r = o.r / 255,
+      g = o.g / 255,
+      b = o.b / 255,
+      l = (BC_DA * b + ED * r - EB * g) / (BC_DA + ED - EB),
+      bl = b - l,
+      k = (E * (g - l) - C * bl) / D,
+      s = Math.sqrt(k * k + bl * bl) / (E * l * (1 - l)), // NaN if l=0 or l=1
+      h = s ? Math.atan2(k, bl) * rad2deg - 120 : NaN;
+  return new Cubehelix(h < 0 ? h + 360 : h, s, l, o.opacity);
+}
+
+function cubehelix(h, s, l, opacity) {
+  return arguments.length === 1 ? cubehelixConvert(h) : new Cubehelix(h, s, l, opacity == null ? 1 : opacity);
+}
+
+function Cubehelix(h, s, l, opacity) {
+  this.h = +h;
+  this.s = +s;
+  this.l = +l;
+  this.opacity = +opacity;
+}
+
+define(Cubehelix, cubehelix, extend(Color, {
+  brighter: function(k) {
+    k = k == null ? brighter : Math.pow(brighter, k);
+    return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
+  },
+  darker: function(k) {
+    k = k == null ? darker : Math.pow(darker, k);
+    return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
+  },
+  rgb: function() {
+    var h = isNaN(this.h) ? 0 : (this.h + 120) * deg2rad,
+        l = +this.l,
+        a = isNaN(this.s) ? 0 : this.s * l * (1 - l),
+        cosh = Math.cos(h),
+        sinh = Math.sin(h);
+    return new Rgb(
+      255 * (l + a * (A * cosh + B * sinh)),
+      255 * (l + a * (C * cosh + D * sinh)),
+      255 * (l + a * (E * cosh)),
+      this.opacity
+    );
+  }
+}));
+
+function basis(t1, v0, v1, v2, v3) {
+  var t2 = t1 * t1, t3 = t2 * t1;
+  return ((1 - 3 * t1 + 3 * t2 - t3) * v0
+      + (4 - 6 * t2 + 3 * t3) * v1
+      + (1 + 3 * t1 + 3 * t2 - 3 * t3) * v2
+      + t3 * v3) / 6;
+}
+
+var basis$1 = function(values) {
+  var n = values.length - 1;
+  return function(t) {
+    var i = t <= 0 ? (t = 0) : t >= 1 ? (t = 1, n - 1) : Math.floor(t * n),
+        v1 = values[i],
+        v2 = values[i + 1],
+        v0 = i > 0 ? values[i - 1] : 2 * v1 - v2,
+        v3 = i < n - 1 ? values[i + 2] : 2 * v2 - v1;
+    return basis((t - i / n) * n, v0, v1, v2, v3);
+  };
+};
+
+var basisClosed = function(values) {
+  var n = values.length;
+  return function(t) {
+    var i = Math.floor(((t %= 1) < 0 ? ++t : t) * n),
+        v0 = values[(i + n - 1) % n],
+        v1 = values[i % n],
+        v2 = values[(i + 1) % n],
+        v3 = values[(i + 2) % n];
+    return basis((t - i / n) * n, v0, v1, v2, v3);
+  };
+};
+
+var constant$3 = function(x) {
+  return function() {
+    return x;
+  };
+};
+
+function linear(a, d) {
+  return function(t) {
+    return a + t * d;
+  };
+}
+
+function exponential(a, b, y) {
+  return a = Math.pow(a, y), b = Math.pow(b, y) - a, y = 1 / y, function(t) {
+    return Math.pow(a + t * b, y);
+  };
+}
+
+function hue(a, b) {
+  var d = b - a;
+  return d ? linear(a, d > 180 || d < -180 ? d - 360 * Math.round(d / 360) : d) : constant$3(isNaN(a) ? b : a);
+}
+
+function gamma(y) {
+  return (y = +y) === 1 ? nogamma : function(a, b) {
+    return b - a ? exponential(a, b, y) : constant$3(isNaN(a) ? b : a);
+  };
+}
+
+function nogamma(a, b) {
+  var d = b - a;
+  return d ? linear(a, d) : constant$3(isNaN(a) ? b : a);
+}
+
+var interpolateRgb = ((function rgbGamma(y) {
+  var color$$1 = gamma(y);
+
+  function rgb$$1(start, end) {
+    var r = color$$1((start = rgb(start)).r, (end = rgb(end)).r),
+        g = color$$1(start.g, end.g),
+        b = color$$1(start.b, end.b),
+        opacity = nogamma(start.opacity, end.opacity);
+    return function(t) {
+      start.r = r(t);
+      start.g = g(t);
+      start.b = b(t);
+      start.opacity = opacity(t);
+      return start + "";
+    };
+  }
+
+  rgb$$1.gamma = rgbGamma;
+
+  return rgb$$1;
+}))(1);
+
+function rgbSpline(spline) {
+  return function(colors) {
+    var n = colors.length,
+        r = new Array(n),
+        g = new Array(n),
+        b = new Array(n),
+        i, color$$1;
+    for (i = 0; i < n; ++i) {
+      color$$1 = rgb(colors[i]);
+      r[i] = color$$1.r || 0;
+      g[i] = color$$1.g || 0;
+      b[i] = color$$1.b || 0;
+    }
+    r = spline(r);
+    g = spline(g);
+    b = spline(b);
+    color$$1.opacity = 1;
+    return function(t) {
+      color$$1.r = r(t);
+      color$$1.g = g(t);
+      color$$1.b = b(t);
+      return color$$1 + "";
     };
-  }
-  d3_selectionPrototype.insert = function(name, before) {
-    name = d3_selection_creator(name);
-    before = d3_selection_selector(before);
-    return this.select(function() {
-      return this.insertBefore(name.apply(this, arguments), before.apply(this, arguments) || null);
-    });
-  };
-  d3_selectionPrototype.remove = function() {
-    return this.each(function() {
-      var parent = this.parentNode;
-      if (parent) parent.removeChild(this);
+  };
+}
+
+var rgbBasis = rgbSpline(basis$1);
+var rgbBasisClosed = rgbSpline(basisClosed);
+
+var array$1 = function(a, b) {
+  var nb = b ? b.length : 0,
+      na = a ? Math.min(nb, a.length) : 0,
+      x = new Array(nb),
+      c = new Array(nb),
+      i;
+
+  for (i = 0; i < na; ++i) x[i] = interpolateValue(a[i], b[i]);
+  for (; i < nb; ++i) c[i] = b[i];
+
+  return function(t) {
+    for (i = 0; i < na; ++i) c[i] = x[i](t);
+    return c;
+  };
+};
+
+var date = function(a, b) {
+  var d = new Date;
+  return a = +a, b -= a, function(t) {
+    return d.setTime(a + b * t), d;
+  };
+};
+
+var reinterpolate = function(a, b) {
+  return a = +a, b -= a, function(t) {
+    return a + b * t;
+  };
+};
+
+var object = function(a, b) {
+  var i = {},
+      c = {},
+      k;
+
+  if (a === null || typeof a !== "object") a = {};
+  if (b === null || typeof b !== "object") b = {};
+
+  for (k in b) {
+    if (k in a) {
+      i[k] = interpolateValue(a[k], b[k]);
+    } else {
+      c[k] = b[k];
+    }
+  }
+
+  return function(t) {
+    for (k in i) c[k] = i[k](t);
+    return c;
+  };
+};
+
+var reA = /[-+]?(?:\d+\.?\d*|\.?\d+)(?:[eE][-+]?\d+)?/g;
+var reB = new RegExp(reA.source, "g");
+
+function zero(b) {
+  return function() {
+    return b;
+  };
+}
+
+function one(b) {
+  return function(t) {
+    return b(t) + "";
+  };
+}
+
+var interpolateString = function(a, b) {
+  var bi = reA.lastIndex = reB.lastIndex = 0, // scan index for next number in b
+      am, // current match in a
+      bm, // current match in b
+      bs, // string preceding current number in b, if any
+      i = -1, // index in s
+      s = [], // string constants and placeholders
+      q = []; // number interpolators
+
+  // Coerce inputs to strings.
+  a = a + "", b = b + "";
+
+  // Interpolate pairs of numbers in a & b.
+  while ((am = reA.exec(a))
+      && (bm = reB.exec(b))) {
+    if ((bs = bm.index) > bi) { // a string precedes the next number in b
+      bs = b.slice(bi, bs);
+      if (s[i]) s[i] += bs; // coalesce with previous string
+      else s[++i] = bs;
+    }
+    if ((am = am[0]) === (bm = bm[0])) { // numbers in a & b match
+      if (s[i]) s[i] += bm; // coalesce with previous string
+      else s[++i] = bm;
+    } else { // interpolate non-matching numbers
+      s[++i] = null;
+      q.push({i: i, x: reinterpolate(am, bm)});
+    }
+    bi = reB.lastIndex;
+  }
+
+  // Add remains of b.
+  if (bi < b.length) {
+    bs = b.slice(bi);
+    if (s[i]) s[i] += bs; // coalesce with previous string
+    else s[++i] = bs;
+  }
+
+  // Special optimization for only a single match.
+  // Otherwise, interpolate each of the numbers and rejoin the string.
+  return s.length < 2 ? (q[0]
+      ? one(q[0].x)
+      : zero(b))
+      : (b = q.length, function(t) {
+          for (var i = 0, o; i < b; ++i) s[(o = q[i]).i] = o.x(t);
+          return s.join("");
+        });
+};
+
+var interpolateValue = function(a, b) {
+  var t = typeof b, c;
+  return b == null || t === "boolean" ? constant$3(b)
+      : (t === "number" ? reinterpolate
+      : t === "string" ? ((c = color(b)) ? (b = c, interpolateRgb) : interpolateString)
+      : b instanceof color ? interpolateRgb
+      : b instanceof Date ? date
+      : Array.isArray(b) ? array$1
+      : typeof b.valueOf !== "function" && typeof b.toString !== "function" || isNaN(b) ? object
+      : reinterpolate)(a, b);
+};
+
+var interpolateRound = function(a, b) {
+  return a = +a, b -= a, function(t) {
+    return Math.round(a + b * t);
+  };
+};
+
+var degrees = 180 / Math.PI;
+
+var identity$2 = {
+  translateX: 0,
+  translateY: 0,
+  rotate: 0,
+  skewX: 0,
+  scaleX: 1,
+  scaleY: 1
+};
+
+var decompose = function(a, b, c, d, e, f) {
+  var scaleX, scaleY, skewX;
+  if (scaleX = Math.sqrt(a * a + b * b)) a /= scaleX, b /= scaleX;
+  if (skewX = a * c + b * d) c -= a * skewX, d -= b * skewX;
+  if (scaleY = Math.sqrt(c * c + d * d)) c /= scaleY, d /= scaleY, skewX /= scaleY;
+  if (a * d < b * c) a = -a, b = -b, skewX = -skewX, scaleX = -scaleX;
+  return {
+    translateX: e,
+    translateY: f,
+    rotate: Math.atan2(b, a) * degrees,
+    skewX: Math.atan(skewX) * degrees,
+    scaleX: scaleX,
+    scaleY: scaleY
+  };
+};
+
+var cssNode;
+var cssRoot;
+var cssView;
+var svgNode;
+
+function parseCss(value) {
+  if (value === "none") return identity$2;
+  if (!cssNode) cssNode = document.createElement("DIV"), cssRoot = document.documentElement, cssView = document.defaultView;
+  cssNode.style.transform = value;
+  value = cssView.getComputedStyle(cssRoot.appendChild(cssNode), null).getPropertyValue("transform");
+  cssRoot.removeChild(cssNode);
+  value = value.slice(7, -1).split(",");
+  return decompose(+value[0], +value[1], +value[2], +value[3], +value[4], +value[5]);
+}
+
+function parseSvg(value) {
+  if (value == null) return identity$2;
+  if (!svgNode) svgNode = document.createElementNS("http://www.w3.org/2000/svg", "g");
+  svgNode.setAttribute("transform", value);
+  if (!(value = svgNode.transform.baseVal.consolidate())) return identity$2;
+  value = value.matrix;
+  return decompose(value.a, value.b, value.c, value.d, value.e, value.f);
+}
+
+function interpolateTransform(parse, pxComma, pxParen, degParen) {
+
+  function pop(s) {
+    return s.length ? s.pop() + " " : "";
+  }
+
+  function translate(xa, ya, xb, yb, s, q) {
+    if (xa !== xb || ya !== yb) {
+      var i = s.push("translate(", null, pxComma, null, pxParen);
+      q.push({i: i - 4, x: reinterpolate(xa, xb)}, {i: i - 2, x: reinterpolate(ya, yb)});
+    } else if (xb || yb) {
+      s.push("translate(" + xb + pxComma + yb + pxParen);
+    }
+  }
+
+  function rotate(a, b, s, q) {
+    if (a !== b) {
+      if (a - b > 180) b += 360; else if (b - a > 180) a += 360; // shortest path
+      q.push({i: s.push(pop(s) + "rotate(", null, degParen) - 2, x: reinterpolate(a, b)});
+    } else if (b) {
+      s.push(pop(s) + "rotate(" + b + degParen);
+    }
+  }
+
+  function skewX(a, b, s, q) {
+    if (a !== b) {
+      q.push({i: s.push(pop(s) + "skewX(", null, degParen) - 2, x: reinterpolate(a, b)});
+    } else if (b) {
+      s.push(pop(s) + "skewX(" + b + degParen);
+    }
+  }
+
+  function scale(xa, ya, xb, yb, s, q) {
+    if (xa !== xb || ya !== yb) {
+      var i = s.push(pop(s) + "scale(", null, ",", null, ")");
+      q.push({i: i - 4, x: reinterpolate(xa, xb)}, {i: i - 2, x: reinterpolate(ya, yb)});
+    } else if (xb !== 1 || yb !== 1) {
+      s.push(pop(s) + "scale(" + xb + "," + yb + ")");
+    }
+  }
+
+  return function(a, b) {
+    var s = [], // string constants and placeholders
+        q = []; // number interpolators
+    a = parse(a), b = parse(b);
+    translate(a.translateX, a.translateY, b.translateX, b.translateY, s, q);
+    rotate(a.rotate, b.rotate, s, q);
+    skewX(a.skewX, b.skewX, s, q);
+    scale(a.scaleX, a.scaleY, b.scaleX, b.scaleY, s, q);
+    a = b = null; // gc
+    return function(t) {
+      var i = -1, n = q.length, o;
+      while (++i < n) s[(o = q[i]).i] = o.x(t);
+      return s.join("");
+    };
+  };
+}
+
+var interpolateTransformCss = interpolateTransform(parseCss, "px, ", "px)", "deg)");
+var interpolateTransformSvg = interpolateTransform(parseSvg, ", ", ")", ")");
+
+var rho = Math.SQRT2;
+var rho2 = 2;
+var rho4 = 4;
+var epsilon2 = 1e-12;
+
+function cosh(x) {
+  return ((x = Math.exp(x)) + 1 / x) / 2;
+}
+
+function sinh(x) {
+  return ((x = Math.exp(x)) - 1 / x) / 2;
+}
+
+function tanh(x) {
+  return ((x = Math.exp(2 * x)) - 1) / (x + 1);
+}
+
+// p0 = [ux0, uy0, w0]
+// p1 = [ux1, uy1, w1]
+var interpolateZoom = function(p0, p1) {
+  var ux0 = p0[0], uy0 = p0[1], w0 = p0[2],
+      ux1 = p1[0], uy1 = p1[1], w1 = p1[2],
+      dx = ux1 - ux0,
+      dy = uy1 - uy0,
+      d2 = dx * dx + dy * dy,
+      i,
+      S;
+
+  // Special case for u0 ≅ u1.
+  if (d2 < epsilon2) {
+    S = Math.log(w1 / w0) / rho;
+    i = function(t) {
+      return [
+        ux0 + t * dx,
+        uy0 + t * dy,
+        w0 * Math.exp(rho * t * S)
+      ];
+    };
+  }
+
+  // General case.
+  else {
+    var d1 = Math.sqrt(d2),
+        b0 = (w1 * w1 - w0 * w0 + rho4 * d2) / (2 * w0 * rho2 * d1),
+        b1 = (w1 * w1 - w0 * w0 - rho4 * d2) / (2 * w1 * rho2 * d1),
+        r0 = Math.log(Math.sqrt(b0 * b0 + 1) - b0),
+        r1 = Math.log(Math.sqrt(b1 * b1 + 1) - b1);
+    S = (r1 - r0) / rho;
+    i = function(t) {
+      var s = t * S,
+          coshr0 = cosh(r0),
+          u = w0 / (rho2 * d1) * (coshr0 * tanh(rho * s + r0) - sinh(r0));
+      return [
+        ux0 + u * dx,
+        uy0 + u * dy,
+        w0 * coshr0 / cosh(rho * s + r0)
+      ];
+    };
+  }
+
+  i.duration = S * 1000;
+
+  return i;
+};
+
+function hsl$1(hue$$1) {
+  return function(start, end) {
+    var h = hue$$1((start = hsl(start)).h, (end = hsl(end)).h),
+        s = nogamma(start.s, end.s),
+        l = nogamma(start.l, end.l),
+        opacity = nogamma(start.opacity, end.opacity);
+    return function(t) {
+      start.h = h(t);
+      start.s = s(t);
+      start.l = l(t);
+      start.opacity = opacity(t);
+      return start + "";
+    };
+  }
+}
+
+var hsl$2 = hsl$1(hue);
+var hslLong = hsl$1(nogamma);
+
+function lab$1(start, end) {
+  var l = nogamma((start = lab(start)).l, (end = lab(end)).l),
+      a = nogamma(start.a, end.a),
+      b = nogamma(start.b, end.b),
+      opacity = nogamma(start.opacity, end.opacity);
+  return function(t) {
+    start.l = l(t);
+    start.a = a(t);
+    start.b = b(t);
+    start.opacity = opacity(t);
+    return start + "";
+  };
+}
+
+function hcl$1(hue$$1) {
+  return function(start, end) {
+    var h = hue$$1((start = hcl(start)).h, (end = hcl(end)).h),
+        c = nogamma(start.c, end.c),
+        l = nogamma(start.l, end.l),
+        opacity = nogamma(start.opacity, end.opacity);
+    return function(t) {
+      start.h = h(t);
+      start.c = c(t);
+      start.l = l(t);
+      start.opacity = opacity(t);
+      return start + "";
+    };
+  }
+}
+
+var hcl$2 = hcl$1(hue);
+var hclLong = hcl$1(nogamma);
+
+function cubehelix$1(hue$$1) {
+  return (function cubehelixGamma(y) {
+    y = +y;
+
+    function cubehelix$$1(start, end) {
+      var h = hue$$1((start = cubehelix(start)).h, (end = cubehelix(end)).h),
+          s = nogamma(start.s, end.s),
+          l = nogamma(start.l, end.l),
+          opacity = nogamma(start.opacity, end.opacity);
+      return function(t) {
+        start.h = h(t);
+        start.s = s(t);
+        start.l = l(Math.pow(t, y));
+        start.opacity = opacity(t);
+        return start + "";
+      };
+    }
+
+    cubehelix$$1.gamma = cubehelixGamma;
+
+    return cubehelix$$1;
+  })(1);
+}
+
+var cubehelix$2 = cubehelix$1(hue);
+var cubehelixLong = cubehelix$1(nogamma);
+
+var quantize = function(interpolator, n) {
+  var samples = new Array(n);
+  for (var i = 0; i < n; ++i) samples[i] = interpolator(i / (n - 1));
+  return samples;
+};
+
+var frame = 0;
+var timeout = 0;
+var interval = 0;
+var pokeDelay = 1000;
+var taskHead;
+var taskTail;
+var clockLast = 0;
+var clockNow = 0;
+var clockSkew = 0;
+var clock = typeof performance === "object" && performance.now ? performance : Date;
+var setFrame = typeof requestAnimationFrame === "function" ? requestAnimationFrame : function(f) { setTimeout(f, 17); };
+
+function now() {
+  return clockNow || (setFrame(clearNow), clockNow = clock.now() + clockSkew);
+}
+
+function clearNow() {
+  clockNow = 0;
+}
+
+function Timer() {
+  this._call =
+  this._time =
+  this._next = null;
+}
+
+Timer.prototype = timer.prototype = {
+  constructor: Timer,
+  restart: function(callback, delay, time) {
+    if (typeof callback !== "function") throw new TypeError("callback is not a function");
+    time = (time == null ? now() : +time) + (delay == null ? 0 : +delay);
+    if (!this._next && taskTail !== this) {
+      if (taskTail) taskTail._next = this;
+      else taskHead = this;
+      taskTail = this;
+    }
+    this._call = callback;
+    this._time = time;
+    sleep();
+  },
+  stop: function() {
+    if (this._call) {
+      this._call = null;
+      this._time = Infinity;
+      sleep();
+    }
+  }
+};
+
+function timer(callback, delay, time) {
+  var t = new Timer;
+  t.restart(callback, delay, time);
+  return t;
+}
+
+function timerFlush() {
+  now(); // Get the current time, if not already set.
+  ++frame; // Pretend we’ve set an alarm, if we haven’t already.
+  var t = taskHead, e;
+  while (t) {
+    if ((e = clockNow - t._time) >= 0) t._call.call(null, e);
+    t = t._next;
+  }
+  --frame;
+}
+
+function wake() {
+  clockNow = (clockLast = clock.now()) + clockSkew;
+  frame = timeout = 0;
+  try {
+    timerFlush();
+  } finally {
+    frame = 0;
+    nap();
+    clockNow = 0;
+  }
+}
+
+function poke() {
+  var now = clock.now(), delay = now - clockLast;
+  if (delay > pokeDelay) clockSkew -= delay, clockLast = now;
+}
+
+function nap() {
+  var t0, t1 = taskHead, t2, time = Infinity;
+  while (t1) {
+    if (t1._call) {
+      if (time > t1._time) time = t1._time;
+      t0 = t1, t1 = t1._next;
+    } else {
+      t2 = t1._next, t1._next = null;
+      t1 = t0 ? t0._next = t2 : taskHead = t2;
+    }
+  }
+  taskTail = t0;
+  sleep(time);
+}
+
+function sleep(time) {
+  if (frame) return; // Soonest alarm already set, or will be.
+  if (timeout) timeout = clearTimeout(timeout);
+  var delay = time - clockNow;
+  if (delay > 24) {
+    if (time < Infinity) timeout = setTimeout(wake, delay);
+    if (interval) interval = clearInterval(interval);
+  } else {
+    if (!interval) clockLast = clockNow, interval = setInterval(poke, pokeDelay);
+    frame = 1, setFrame(wake);
+  }
+}
+
+var timeout$1 = function(callback, delay, time) {
+  var t = new Timer;
+  delay = delay == null ? 0 : +delay;
+  t.restart(function(elapsed) {
+    t.stop();
+    callback(elapsed + delay);
+  }, delay, time);
+  return t;
+};
+
+var interval$1 = function(callback, delay, time) {
+  var t = new Timer, total = delay;
+  if (delay == null) return t.restart(callback, delay, time), t;
+  delay = +delay, time = time == null ? now() : +time;
+  t.restart(function tick(elapsed) {
+    elapsed += total;
+    t.restart(tick, total += delay, time);
+    callback(elapsed);
+  }, delay, time);
+  return t;
+};
+
+var emptyOn = dispatch("start", "end", "interrupt");
+var emptyTween = [];
+
+var CREATED = 0;
+var SCHEDULED = 1;
+var STARTING = 2;
+var STARTED = 3;
+var RUNNING = 4;
+var ENDING = 5;
+var ENDED = 6;
+
+var schedule = function(node, name, id, index, group, timing) {
+  var schedules = node.__transition;
+  if (!schedules) node.__transition = {};
+  else if (id in schedules) return;
+  create(node, id, {
+    name: name,
+    index: index, // For context during callback.
+    group: group, // For context during callback.
+    on: emptyOn,
+    tween: emptyTween,
+    time: timing.time,
+    delay: timing.delay,
+    duration: timing.duration,
+    ease: timing.ease,
+    timer: null,
+    state: CREATED
+  });
+};
+
+function init(node, id) {
+  var schedule = node.__transition;
+  if (!schedule || !(schedule = schedule[id]) || schedule.state > CREATED) throw new Error("too late");
+  return schedule;
+}
+
+function set$1(node, id) {
+  var schedule = node.__transition;
+  if (!schedule || !(schedule = schedule[id]) || schedule.state > STARTING) throw new Error("too late");
+  return schedule;
+}
+
+function get$1(node, id) {
+  var schedule = node.__transition;
+  if (!schedule || !(schedule = schedule[id])) throw new Error("too late");
+  return schedule;
+}
+
+function create(node, id, self) {
+  var schedules = node.__transition,
+      tween;
+
+  // Initialize the self timer when the transition is created.
+  // Note the actual delay is not known until the first callback!
+  schedules[id] = self;
+  self.timer = timer(schedule, 0, self.time);
+
+  function schedule(elapsed) {
+    self.state = SCHEDULED;
+    self.timer.restart(start, self.delay, self.time);
+
+    // If the elapsed delay is less than our first sleep, start immediately.
+    if (self.delay <= elapsed) start(elapsed - self.delay);
+  }
+
+  function start(elapsed) {
+    var i, j, n, o;
+
+    // If the state is not SCHEDULED, then we previously errored on start.
+    if (self.state !== SCHEDULED) return stop();
+
+    for (i in schedules) {
+      o = schedules[i];
+      if (o.name !== self.name) continue;
+
+      // While this element already has a starting transition during this frame,
+      // defer starting an interrupting transition until that transition has a
+      // chance to tick (and possibly end); see d3/d3-transition#54!
+      if (o.state === STARTED) return timeout$1(start);
+
+      // Interrupt the active transition, if any.
+      // Dispatch the interrupt event.
+      if (o.state === RUNNING) {
+        o.state = ENDED;
+        o.timer.stop();
+        o.on.call("interrupt", node, node.__data__, o.index, o.group);
+        delete schedules[i];
+      }
+
+      // Cancel any pre-empted transitions. No interrupt event is dispatched
+      // because the cancelled transitions never started. Note that this also
+      // removes this transition from the pending list!
+      else if (+i < id) {
+        o.state = ENDED;
+        o.timer.stop();
+        delete schedules[i];
+      }
+    }
+
+    // Defer the first tick to end of the current frame; see d3/d3#1576.
+    // Note the transition may be canceled after start and before the first tick!
+    // Note this must be scheduled before the start event; see d3/d3-transition#16!
+    // Assuming this is successful, subsequent callbacks go straight to tick.
+    timeout$1(function() {
+      if (self.state === STARTED) {
+        self.state = RUNNING;
+        self.timer.restart(tick, self.delay, self.time);
+        tick(elapsed);
+      }
     });
-  };
-  d3_selectionPrototype.data = function(value, key) {
-    var i = -1, n = this.length, group, node;
-    if (!arguments.length) {
-      value = new Array(n = (group = this[0]).length);
-      while (++i < n) {
-        if (node = group[i]) {
-          value[i] = node.__data__;
-        }
-      }
-      return value;
-    }
-    function bind(group, groupData) {
-      var i, n = group.length, m = groupData.length, n0 = Math.min(n, m), updateNodes = new Array(m), enterNodes = new Array(m), exitNodes = new Array(n), node, nodeData;
-      if (key) {
-        var nodeByKeyValue = new d3_Map(), dataByKeyValue = new d3_Map(), keyValues = [], keyValue;
-        for (i = -1; ++i < n; ) {
-          keyValue = key.call(node = group[i], node.__data__, i);
-          if (nodeByKeyValue.has(keyValue)) {
-            exitNodes[i] = node;
-          } else {
-            nodeByKeyValue.set(keyValue, node);
-          }
-          keyValues.push(keyValue);
-        }
-        for (i = -1; ++i < m; ) {
-          keyValue = key.call(groupData, nodeData = groupData[i], i);
-          if (node = nodeByKeyValue.get(keyValue)) {
-            updateNodes[i] = node;
-            node.__data__ = nodeData;
-          } else if (!dataByKeyValue.has(keyValue)) {
-            enterNodes[i] = d3_selection_dataNode(nodeData);
-          }
-          dataByKeyValue.set(keyValue, nodeData);
-          nodeByKeyValue.remove(keyValue);
-        }
-        for (i = -1; ++i < n; ) {
-          if (nodeByKeyValue.has(keyValues[i])) {
-            exitNodes[i] = group[i];
-          }
-        }
-      } else {
-        for (i = -1; ++i < n0; ) {
-          node = group[i];
-          nodeData = groupData[i];
-          if (node) {
-            node.__data__ = nodeData;
-            updateNodes[i] = node;
-          } else {
-            enterNodes[i] = d3_selection_dataNode(nodeData);
-          }
-        }
-        for (;i < m; ++i) {
-          enterNodes[i] = d3_selection_dataNode(groupData[i]);
-        }
-        for (;i < n; ++i) {
-          exitNodes[i] = group[i];
-        }
-      }
-      enterNodes.update = updateNodes;
-      enterNodes.parentNode = updateNodes.parentNode = exitNodes.parentNode = group.parentNode;
-      enter.push(enterNodes);
-      update.push(updateNodes);
-      exit.push(exitNodes);
-    }
-    var enter = d3_selection_enter([]), update = d3_selection([]), exit = d3_selection([]);
-    if (typeof value === "function") {
-      while (++i < n) {
-        bind(group = this[i], value.call(group, group.parentNode.__data__, i));
-      }
-    } else {
-      while (++i < n) {
-        bind(group = this[i], value);
-      }
-    }
-    update.enter = function() {
-      return enter;
-    };
-    update.exit = function() {
-      return exit;
-    };
-    return update;
-  };
-  function d3_selection_dataNode(data) {
-    return {
-      __data__: data
-    };
-  }
-  d3_selectionPrototype.datum = function(value) {
-    return arguments.length ? this.property("__data__", value) : this.property("__data__");
-  };
-  d3_selectionPrototype.filter = function(filter) {
-    var subgroups = [], subgroup, group, node;
-    if (typeof filter !== "function") filter = d3_selection_filter(filter);
-    for (var j = 0, m = this.length; j < m; j++) {
-      subgroups.push(subgroup = []);
-      subgroup.parentNode = (group = this[j]).parentNode;
-      for (var i = 0, n = group.length; i < n; i++) {
-        if ((node = group[i]) && filter.call(node, node.__data__, i, j)) {
-          subgroup.push(node);
-        }
-      }
-    }
-    return d3_selection(subgroups);
-  };
-  function d3_selection_filter(selector) {
-    return function() {
-      return d3_selectMatches(this, selector);
-    };
-  }
-  d3_selectionPrototype.order = function() {
-    for (var j = -1, m = this.length; ++j < m; ) {
-      for (var group = this[j], i = group.length - 1, next = group[i], node; --i >= 0; ) {
-        if (node = group[i]) {
-          if (next && next !== node.nextSibling) next.parentNode.insertBefore(node, next);
-          next = node;
-        }
-      }
-    }
-    return this;
-  };
-  d3_selectionPrototype.sort = function(comparator) {
-    comparator = d3_selection_sortComparator.apply(this, arguments);
-    for (var j = -1, m = this.length; ++j < m; ) this[j].sort(comparator);
-    return this.order();
-  };
-  function d3_selection_sortComparator(comparator) {
-    if (!arguments.length) comparator = d3_ascending;
-    return function(a, b) {
-      return a && b ? comparator(a.__data__, b.__data__) : !a - !b;
-    };
-  }
-  d3_selectionPrototype.each = function(callback) {
-    return d3_selection_each(this, function(node, i, j) {
-      callback.call(node, node.__data__, i, j);
-    });
-  };
-  function d3_selection_each(groups, callback) {
-    for (var j = 0, m = groups.length; j < m; j++) {
-      for (var group = groups[j], i = 0, n = group.length, node; i < n; i++) {
-        if (node = group[i]) callback(node, i, j);
-      }
-    }
-    return groups;
-  }
-  d3_selectionPrototype.call = function(callback) {
-    var args = d3_array(arguments);
-    callback.apply(args[0] = this, args);
-    return this;
-  };
-  d3_selectionPrototype.empty = function() {
-    return !this.node();
-  };
-  d3_selectionPrototype.node = function() {
-    for (var j = 0, m = this.length; j < m; j++) {
-      for (var group = this[j], i = 0, n = group.length; i < n; i++) {
-        var node = group[i];
-        if (node) return node;
+
+    // Dispatch the start event.
+    // Note this must be done before the tween are initialized.
+    self.state = STARTING;
+    self.on.call("start", node, node.__data__, self.index, self.group);
+    if (self.state !== STARTING) return; // interrupted
+    self.state = STARTED;
+
+    // Initialize the tween, deleting null tween.
+    tween = new Array(n = self.tween.length);
+    for (i = 0, j = -1; i < n; ++i) {
+      if (o = self.tween[i].value.call(node, node.__data__, self.index, self.group)) {
+        tween[++j] = o;
+      }
+    }
+    tween.length = j + 1;
+  }
+
+  function tick(elapsed) {
+    var t = elapsed < self.duration ? self.ease.call(null, elapsed / self.duration) : (self.timer.restart(stop), self.state = ENDING, 1),
+        i = -1,
+        n = tween.length;
+
+    while (++i < n) {
+      tween[i].call(null, t);
+    }
+
+    // Dispatch the end event.
+    if (self.state === ENDING) {
+      self.on.call("end", node, node.__data__, self.index, self.group);
+      stop();
+    }
+  }
+
+  function stop() {
+    self.state = ENDED;
+    self.timer.stop();
+    delete schedules[id];
+    for (var i in schedules) return; // eslint-disable-line no-unused-vars
+    delete node.__transition;
+  }
+}
+
+var interrupt = function(node, name) {
+  var schedules = node.__transition,
+      schedule,
+      active,
+      empty = true,
+      i;
+
+  if (!schedules) return;
+
+  name = name == null ? null : name + "";
+
+  for (i in schedules) {
+    if ((schedule = schedules[i]).name !== name) { empty = false; continue; }
+    active = schedule.state > STARTING && schedule.state < ENDING;
+    schedule.state = ENDED;
+    schedule.timer.stop();
+    if (active) schedule.on.call("interrupt", node, node.__data__, schedule.index, schedule.group);
+    delete schedules[i];
+  }
+
+  if (empty) delete node.__transition;
+};
+
+var selection_interrupt = function(name) {
+  return this.each(function() {
+    interrupt(this, name);
+  });
+};
+
+function tweenRemove(id, name) {
+  var tween0, tween1;
+  return function() {
+    var schedule = set$1(this, id),
+        tween = schedule.tween;
+
+    // If this node shared tween with the previous node,
+    // just assign the updated shared tween and we’re done!
+    // Otherwise, copy-on-write.
+    if (tween !== tween0) {
+      tween1 = tween0 = tween;
+      for (var i = 0, n = tween1.length; i < n; ++i) {
+        if (tween1[i].name === name) {
+          tween1 = tween1.slice();
+          tween1.splice(i, 1);
+          break;
+        }
+      }
+    }
+
+    schedule.tween = tween1;
+  };
+}
+
+function tweenFunction(id, name, value) {
+  var tween0, tween1;
+  if (typeof value !== "function") throw new Error;
+  return function() {
+    var schedule = set$1(this, id),
+        tween = schedule.tween;
+
+    // If this node shared tween with the previous node,
+    // just assign the updated shared tween and we’re done!
+    // Otherwise, copy-on-write.
+    if (tween !== tween0) {
+      tween1 = (tween0 = tween).slice();
+      for (var t = {name: name, value: value}, i = 0, n = tween1.length; i < n; ++i) {
+        if (tween1[i].name === name) {
+          tween1[i] = t;
+          break;
+        }
+      }
+      if (i === n) tween1.push(t);
+    }
+
+    schedule.tween = tween1;
+  };
+}
+
+var transition_tween = function(name, value) {
+  var id = this._id;
+
+  name += "";
+
+  if (arguments.length < 2) {
+    var tween = get$1(this.node(), id).tween;
+    for (var i = 0, n = tween.length, t; i < n; ++i) {
+      if ((t = tween[i]).name === name) {
+        return t.value;
       }
     }
     return null;
-  };
-  d3_selectionPrototype.size = function() {
-    var n = 0;
-    this.each(function() {
-      ++n;
-    });
-    return n;
-  };
-  function d3_selection_enter(selection) {
-    d3_subclass(selection, d3_selection_enterPrototype);
-    return selection;
-  }
-  var d3_selection_enterPrototype = [];
-  d3.selection.enter = d3_selection_enter;
-  d3.selection.enter.prototype = d3_selection_enterPrototype;
-  d3_selection_enterPrototype.append = d3_selectionPrototype.append;
-  d3_selection_enterPrototype.empty = d3_selectionPrototype.empty;
-  d3_selection_enterPrototype.node = d3_selectionPrototype.node;
-  d3_selection_enterPrototype.call = d3_selectionPrototype.call;
-  d3_selection_enterPrototype.size = d3_selectionPrototype.size;
-  d3_selection_enterPrototype.select = function(selector) {
-    var subgroups = [], subgroup, subnode, upgroup, group, node;
-    for (var j = -1, m = this.length; ++j < m; ) {
-      upgroup = (group = this[j]).update;
-      subgroups.push(subgroup = []);
-      subgroup.parentNode = group.parentNode;
-      for (var i = -1, n = group.length; ++i < n; ) {
-        if (node = group[i]) {
-          subgroup.push(upgroup[i] = subnode = selector.call(group.parentNode, node.__data__, i, j));
-          subnode.__data__ = node.__data__;
-        } else {
-          subgroup.push(null);
-        }
-      }
-    }
-    return d3_selection(subgroups);
-  };
-  d3_selection_enterPrototype.insert = function(name, before) {
-    if (arguments.length < 2) before = d3_selection_enterInsertBefore(this);
-    return d3_selectionPrototype.insert.call(this, name, before);
-  };
-  function d3_selection_enterInsertBefore(enter) {
-    var i0, j0;
-    return function(d, i, j) {
-      var group = enter[j].update, n = group.length, node;
-      if (j != j0) j0 = j, i0 = 0;
-      if (i >= i0) i0 = i + 1;
-      while (!(node = group[i0]) && ++i0 < n) ;
-      return node;
+  }
+
+  return this.each((value == null ? tweenRemove : tweenFunction)(id, name, value));
+};
+
+function tweenValue(transition, name, value) {
+  var id = transition._id;
+
+  transition.each(function() {
+    var schedule = set$1(this, id);
+    (schedule.value || (schedule.value = {}))[name] = value.apply(this, arguments);
+  });
+
+  return function(node) {
+    return get$1(node, id).value[name];
+  };
+}
+
+var interpolate$$1 = function(a, b) {
+  var c;
+  return (typeof b === "number" ? reinterpolate
+      : b instanceof color ? interpolateRgb
+      : (c = color(b)) ? (b = c, interpolateRgb)
+      : interpolateString)(a, b);
+};
+
+function attrRemove$1(name) {
+  return function() {
+    this.removeAttribute(name);
+  };
+}
+
+function attrRemoveNS$1(fullname) {
+  return function() {
+    this.removeAttributeNS(fullname.space, fullname.local);
+  };
+}
+
+function attrConstant$1(name, interpolate$$1, value1) {
+  var value00,
+      interpolate0;
+  return function() {
+    var value0 = this.getAttribute(name);
+    return value0 === value1 ? null
+        : value0 === value00 ? interpolate0
+        : interpolate0 = interpolate$$1(value00 = value0, value1);
+  };
+}
+
+function attrConstantNS$1(fullname, interpolate$$1, value1) {
+  var value00,
+      interpolate0;
+  return function() {
+    var value0 = this.getAttributeNS(fullname.space, fullname.local);
+    return value0 === value1 ? null
+        : value0 === value00 ? interpolate0
+        : interpolate0 = interpolate$$1(value00 = value0, value1);
+  };
+}
+
+function attrFunction$1(name, interpolate$$1, value) {
+  var value00,
+      value10,
+      interpolate0;
+  return function() {
+    var value0, value1 = value(this);
+    if (value1 == null) return void this.removeAttribute(name);
+    value0 = this.getAttribute(name);
+    return value0 === value1 ? null
+        : value0 === value00 && value1 === value10 ? interpolate0
+        : interpolate0 = interpolate$$1(value00 = value0, value10 = value1);
+  };
+}
+
+function attrFunctionNS$1(fullname, interpolate$$1, value) {
+  var value00,
+      value10,
+      interpolate0;
+  return function() {
+    var value0, value1 = value(this);
+    if (value1 == null) return void this.removeAttributeNS(fullname.space, fullname.local);
+    value0 = this.getAttributeNS(fullname.space, fullname.local);
+    return value0 === value1 ? null
+        : value0 === value00 && value1 === value10 ? interpolate0
+        : interpolate0 = interpolate$$1(value00 = value0, value10 = value1);
+  };
+}
+
+var transition_attr = function(name, value) {
+  var fullname = namespace(name), i = fullname === "transform" ? interpolateTransformSvg : interpolate$$1;
+  return this.attrTween(name, typeof value === "function"
+      ? (fullname.local ? attrFunctionNS$1 : attrFunction$1)(fullname, i, tweenValue(this, "attr." + name, value))
+      : value == null ? (fullname.local ? attrRemoveNS$1 : attrRemove$1)(fullname)
+      : (fullname.local ? attrConstantNS$1 : attrConstant$1)(fullname, i, value + ""));
+};
+
+function attrTweenNS(fullname, value) {
+  function tween() {
+    var node = this, i = value.apply(node, arguments);
+    return i && function(t) {
+      node.setAttributeNS(fullname.space, fullname.local, i(t));
     };
   }
-  d3_selectionPrototype.transition = function() {
-    var id = d3_transitionInheritId || ++d3_transitionId, subgroups = [], subgroup, node, transition = d3_transitionInherit || {
-      time: Date.now(),
-      ease: d3_ease_cubicInOut,
-      delay: 0,
-      duration: 250
+  tween._value = value;
+  return tween;
+}
+
+function attrTween(name, value) {
+  function tween() {
+    var node = this, i = value.apply(node, arguments);
+    return i && function(t) {
+      node.setAttribute(name, i(t));
     };
-    for (var j = -1, m = this.length; ++j < m; ) {
-      subgroups.push(subgroup = []);
-      for (var group = this[j], i = -1, n = group.length; ++i < n; ) {
-        if (node = group[i]) d3_transitionNode(node, i, id, transition);
+  }
+  tween._value = value;
+  return tween;
+}
+
+var transition_attrTween = function(name, value) {
+  var key = "attr." + name;
+  if (arguments.length < 2) return (key = this.tween(key)) && key._value;
+  if (value == null) return this.tween(key, null);
+  if (typeof value !== "function") throw new Error;
+  var fullname = namespace(name);
+  return this.tween(key, (fullname.local ? attrTweenNS : attrTween)(fullname, value));
+};
+
+function delayFunction(id, value) {
+  return function() {
+    init(this, id).delay = +value.apply(this, arguments);
+  };
+}
+
+function delayConstant(id, value) {
+  return value = +value, function() {
+    init(this, id).delay = value;
+  };
+}
+
+var transition_delay = function(value) {
+  var id = this._id;
+
+  return arguments.length
+      ? this.each((typeof value === "function"
+          ? delayFunction
+          : delayConstant)(id, value))
+      : get$1(this.node(), id).delay;
+};
+
+function durationFunction(id, value) {
+  return function() {
+    set$1(this, id).duration = +value.apply(this, arguments);
+  };
+}
+
+function durationConstant(id, value) {
+  return value = +value, function() {
+    set$1(this, id).duration = value;
+  };
+}
+
+var transition_duration = function(value) {
+  var id = this._id;
+
+  return arguments.length
+      ? this.each((typeof value === "function"
+          ? durationFunction
+          : durationConstant)(id, value))
+      : get$1(this.node(), id).duration;
+};
+
+function easeConstant(id, value) {
+  if (typeof value !== "function") throw new Error;
+  return function() {
+    set$1(this, id).ease = value;
+  };
+}
+
+var transition_ease = function(value) {
+  var id = this._id;
+
+  return arguments.length
+      ? this.each(easeConstant(id, value))
+      : get$1(this.node(), id).ease;
+};
+
+var transition_filter = function(match) {
+  if (typeof match !== "function") match = matcher$1(match);
+
+  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
+    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {
+      if ((node = group[i]) && match.call(node, node.__data__, i, group)) {
         subgroup.push(node);
       }
     }
-    return d3_transition(subgroups, id);
-  };
-  d3_selectionPrototype.interrupt = function() {
-    return this.each(d3_selection_interrupt);
-  };
-  function d3_selection_interrupt() {
-    var lock = this.__transition__;
-    if (lock) ++lock.active;
-  }
-  d3.select = function(node) {
-    var group = [ typeof node === "string" ? d3_select(node, d3_document) : node ];
-    group.parentNode = d3_documentElement;
-    return d3_selection([ group ]);
-  };
-  d3.selectAll = function(nodes) {
-    var group = d3_array(typeof nodes === "string" ? d3_selectAll(nodes, d3_document) : nodes);
-    group.parentNode = d3_documentElement;
-    return d3_selection([ group ]);
-  };
-  var d3_selectionRoot = d3.select(d3_documentElement);
-  d3_selectionPrototype.on = function(type, listener, capture) {
-    var n = arguments.length;
-    if (n < 3) {
-      if (typeof type !== "string") {
-        if (n < 2) listener = false;
-        for (capture in type) this.each(d3_selection_on(capture, type[capture], listener));
-        return this;
-      }
-      if (n < 2) return (n = this.node()["__on" + type]) && n._;
-      capture = false;
-    }
-    return this.each(d3_selection_on(type, listener, capture));
-  };
-  function d3_selection_on(type, listener, capture) {
-    var name = "__on" + type, i = type.indexOf("."), wrap = d3_selection_onListener;
-    if (i > 0) type = type.substring(0, i);
-    var filter = d3_selection_onFilters.get(type);
-    if (filter) type = filter, wrap = d3_selection_onFilter;
-    function onRemove() {
-      var l = this[name];
-      if (l) {
-        this.removeEventListener(type, l, l.$);
-        delete this[name];
-      }
-    }
-    function onAdd() {
-      var l = wrap(listener, d3_array(arguments));
-      onRemove.call(this);
-      this.addEventListener(type, this[name] = l, l.$ = capture);
-      l._ = listener;
-    }
-    function removeAll() {
-      var re = new RegExp("^__on([^.]+)" + d3.requote(type) + "$"), match;
-      for (var name in this) {
-        if (match = name.match(re)) {
-          var l = this[name];
-          this.removeEventListener(match[1], l, l.$);
-          delete this[name];
-        }
-      }
-    }
-    return i ? listener ? onAdd : onRemove : listener ? d3_noop : removeAll;
-  }
-  var d3_selection_onFilters = d3.map({
-    mouseenter: "mouseover",
-    mouseleave: "mouseout"
+  }
+
+  return new Transition(subgroups, this._parents, this._name, this._id);
+};
+
+var transition_merge = function(transition) {
+  if (transition._id !== this._id) throw new Error;
+
+  for (var groups0 = this._groups, groups1 = transition._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
+    for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
+      if (node = group0[i] || group1[i]) {
+        merge[i] = node;
+      }
+    }
+  }
+
+  for (; j < m0; ++j) {
+    merges[j] = groups0[j];
+  }
+
+  return new Transition(merges, this._parents, this._name, this._id);
+};
+
+function start(name) {
+  return (name + "").trim().split(/^|\s+/).every(function(t) {
+    var i = t.indexOf(".");
+    if (i >= 0) t = t.slice(0, i);
+    return !t || t === "start";
   });
-  d3_selection_onFilters.forEach(function(k) {
-    if ("on" + k in d3_document) d3_selection_onFilters.remove(k);
-  });
-  function d3_selection_onListener(listener, argumentz) {
-    return function(e) {
-      var o = d3.event;
-      d3.event = e;
-      argumentz[0] = this.__data__;
-      try {
-        listener.apply(this, argumentz);
-      } finally {
-        d3.event = o;
-      }
-    };
-  }
-  function d3_selection_onFilter(listener, argumentz) {
-    var l = d3_selection_onListener(listener, argumentz);
-    return function(e) {
-      var target = this, related = e.relatedTarget;
-      if (!related || related !== target && !(related.compareDocumentPosition(target) & 8)) {
-        l.call(target, e);
-      }
+}
+
+function onFunction(id, name, listener) {
+  var on0, on1, sit = start(name) ? init : set$1;
+  return function() {
+    var schedule = sit(this, id),
+        on = schedule.on;
+
+    // If this node shared a dispatch with the previous node,
+    // just assign the updated shared dispatch and we’re done!
+    // Otherwise, copy-on-write.
+    if (on !== on0) (on1 = (on0 = on).copy()).on(name, listener);
+
+    schedule.on = on1;
+  };
+}
+
+var transition_on = function(name, listener) {
+  var id = this._id;
+
+  return arguments.length < 2
+      ? get$1(this.node(), id).on.on(name)
+      : this.each(onFunction(id, name, listener));
+};
+
+function removeFunction(id) {
+  return function() {
+    var parent = this.parentNode;
+    for (var i in this.__transition) if (+i !== id) return;
+    if (parent) parent.removeChild(this);
+  };
+}
+
+var transition_remove = function() {
+  return this.on("end.remove", removeFunction(this._id));
+};
+
+var transition_select = function(select$$1) {
+  var name = this._name,
+      id = this._id;
+
+  if (typeof select$$1 !== "function") select$$1 = selector(select$$1);
+
+  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
+    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
+      if ((node = group[i]) && (subnode = select$$1.call(node, node.__data__, i, group))) {
+        if ("__data__" in node) subnode.__data__ = node.__data__;
+        subgroup[i] = subnode;
+        schedule(subgroup[i], name, id, i, subgroup, get$1(node, id));
+      }
+    }
+  }
+
+  return new Transition(subgroups, this._parents, name, id);
+};
+
+var transition_selectAll = function(select$$1) {
+  var name = this._name,
+      id = this._id;
+
+  if (typeof select$$1 !== "function") select$$1 = selectorAll(select$$1);
+
+  for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
+    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
+      if (node = group[i]) {
+        for (var children = select$$1.call(node, node.__data__, i, group), child, inherit = get$1(node, id), k = 0, l = children.length; k < l; ++k) {
+          if (child = children[k]) {
+            schedule(child, name, id, k, children, inherit);
+          }
+        }
+        subgroups.push(children);
+        parents.push(node);
+      }
+    }
+  }
+
+  return new Transition(subgroups, parents, name, id);
+};
+
+var Selection$1 = selection.prototype.constructor;
+
+var transition_selection = function() {
+  return new Selection$1(this._groups, this._parents);
+};
+
+function styleRemove$1(name, interpolate$$2) {
+  var value00,
+      value10,
+      interpolate0;
+  return function() {
+    var value0 = styleValue(this, name),
+        value1 = (this.style.removeProperty(name), styleValue(this, name));
+    return value0 === value1 ? null
+        : value0 === value00 && value1 === value10 ? interpolate0
+        : interpolate0 = interpolate$$2(value00 = value0, value10 = value1);
+  };
+}
+
+function styleRemoveEnd(name) {
+  return function() {
+    this.style.removeProperty(name);
+  };
+}
+
+function styleConstant$1(name, interpolate$$2, value1) {
+  var value00,
+      interpolate0;
+  return function() {
+    var value0 = styleValue(this, name);
+    return value0 === value1 ? null
+        : value0 === value00 ? interpolate0
+        : interpolate0 = interpolate$$2(value00 = value0, value1);
+  };
+}
+
+function styleFunction$1(name, interpolate$$2, value) {
+  var value00,
+      value10,
+      interpolate0;
+  return function() {
+    var value0 = styleValue(this, name),
+        value1 = value(this);
+    if (value1 == null) value1 = (this.style.removeProperty(name), styleValue(this, name));
+    return value0 === value1 ? null
+        : value0 === value00 && value1 === value10 ? interpolate0
+        : interpolate0 = interpolate$$2(value00 = value0, value10 = value1);
+  };
+}
+
+var transition_style = function(name, value, priority) {
+  var i = (name += "") === "transform" ? interpolateTransformCss : interpolate$$1;
+  return value == null ? this
+          .styleTween(name, styleRemove$1(name, i))
+          .on("end.style." + name, styleRemoveEnd(name))
+      : this.styleTween(name, typeof value === "function"
+          ? styleFunction$1(name, i, tweenValue(this, "style." + name, value))
+          : styleConstant$1(name, i, value + ""), priority);
+};
+
+function styleTween(name, value, priority) {
+  function tween() {
+    var node = this, i = value.apply(node, arguments);
+    return i && function(t) {
+      node.style.setProperty(name, i(t), priority);
     };
   }
-  var d3_event_dragSelect = "onselectstart" in d3_document ? null : d3_vendorSymbol(d3_documentElement.style, "userSelect"), d3_event_dragId = 0;
-  function d3_event_dragSuppress() {
-    var name = ".dragsuppress-" + ++d3_event_dragId, click = "click" + name, w = d3.select(d3_window).on("touchmove" + name, d3_eventPreventDefault).on("dragstart" + name, d3_eventPreventDefault).on("selectstart" + name, d3_eventPreventDefault);
-    if (d3_event_dragSelect) {
-      var style = d3_documentElement.style, select = style[d3_event_dragSelect];
-      style[d3_event_dragSelect] = "none";
-    }
-    return function(suppressClick) {
-      w.on(name, null);
-      if (d3_event_dragSelect) style[d3_event_dragSelect] = select;
-      if (suppressClick) {
-        function off() {
-          w.on(click, null);
-        }
-        w.on(click, function() {
-          d3_eventPreventDefault();
-          off();
-        }, true);
-        setTimeout(off, 0);
-      }
-    };
-  }
-  d3.mouse = function(container) {
-    return d3_mousePoint(container, d3_eventSource());
-  };
-  var d3_mouse_bug44083 = /WebKit/.test(d3_window.navigator.userAgent) ? -1 : 0;
-  function d3_mousePoint(container, e) {
-    if (e.changedTouches) e = e.changedTouches[0];
-    var svg = container.ownerSVGElement || container;
-    if (svg.createSVGPoint) {
-      var point = svg.createSVGPoint();
-      if (d3_mouse_bug44083 < 0 && (d3_window.scrollX || d3_window.scrollY)) {
-        svg = d3.select("body").append("svg").style({
-          position: "absolute",
-          top: 0,
-          left: 0,
-          margin: 0,
-          padding: 0,
-          border: "none"
-        }, "important");
-        var ctm = svg[0][0].getScreenCTM();
-        d3_mouse_bug44083 = !(ctm.f || ctm.e);
-        svg.remove();
-      }
-      if (d3_mouse_bug44083) point.x = e.pageX, point.y = e.pageY; else point.x = e.clientX, 
-      point.y = e.clientY;
-      point = point.matrixTransform(container.getScreenCTM().inverse());
-      return [ point.x, point.y ];
-    }
-    var rect = container.getBoundingClientRect();
-    return [ e.clientX - rect.left - container.clientLeft, e.clientY - rect.top - container.clientTop ];
-  }
-  d3.touches = function(container, touches) {
-    if (arguments.length < 2) touches = d3_eventSource().touches;
-    return touches ? d3_array(touches).map(function(touch) {
-      var point = d3_mousePoint(container, touch);
-      point.identifier = touch.identifier;
-      return point;
-    }) : [];
-  };
-  d3.behavior.drag = function() {
-    var event = d3_eventDispatch(drag, "drag", "dragstart", "dragend"), origin = null, mousedown = dragstart(d3_noop, d3.mouse, d3_behavior_dragMouseSubject, "mousemove", "mouseup"), touchstart = dragstart(d3_behavior_dragTouchId, d3.touch, d3_behavior_dragTouchSubject, "touchmove", "touchend");
-    function drag() {
-      this.on("mousedown.drag", mousedown).on("touchstart.drag", touchstart);
-    }
-    function dragstart(id, position, subject, move, end) {
-      return function() {
-        var that = this, target = d3.event.target, parent = that.parentNode, dispatch = event.of(that, arguments), dragged = 0, dragId = id(), dragName = ".drag" + (dragId == null ? "" : "-" + dragId), dragOffset, dragSubject = d3.select(subject()).on(move + dragName, moved).on(end + dragName, ended), dragRestore = d3_event_dragSuppress(), position0 = position(parent, dragId);
-        if (origin) {
-          dragOffset = origin.apply(that, arguments);
-          dragOffset = [ dragOffset.x - position0[0], dragOffset.y - position0[1] ];
-        } else {
-          dragOffset = [ 0, 0 ];
-        }
-        dispatch({
-          type: "dragstart"
+  tween._value = value;
+  return tween;
+}
+
+var transition_styleTween = function(name, value, priority) {
+  var key = "style." + (name += "");
+  if (arguments.length < 2) return (key = this.tween(key)) && key._value;
+  if (value == null) return this.tween(key, null);
+  if (typeof value !== "function") throw new Error;
+  return this.tween(key, styleTween(name, value, priority == null ? "" : priority));
+};
+
+function textConstant$1(value) {
+  return function() {
+    this.textContent = value;
+  };
+}
+
+function textFunction$1(value) {
+  return function() {
+    var value1 = value(this);
+    this.textContent = value1 == null ? "" : value1;
+  };
+}
+
+var transition_text = function(value) {
+  return this.tween("text", typeof value === "function"
+      ? textFunction$1(tweenValue(this, "text", value))
+      : textConstant$1(value == null ? "" : value + ""));
+};
+
+var transition_transition = function() {
+  var name = this._name,
+      id0 = this._id,
+      id1 = newId();
+
+  for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
+    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
+      if (node = group[i]) {
+        var inherit = get$1(node, id0);
+        schedule(node, name, id1, i, group, {
+          time: inherit.time + inherit.delay + inherit.duration,
+          delay: 0,
+          duration: inherit.duration,
+          ease: inherit.ease
         });
-        function moved() {
-          var position1 = position(parent, dragId), dx, dy;
-          if (!position1) return;
-          dx = position1[0] - position0[0];
-          dy = position1[1] - position0[1];
-          dragged |= dx | dy;
-          position0 = position1;
-          dispatch({
-            type: "drag",
-            x: position1[0] + dragOffset[0],
-            y: position1[1] + dragOffset[1],
-            dx: dx,
-            dy: dy
-          });
-        }
-        function ended() {
-          if (!position(parent, dragId)) return;
-          dragSubject.on(move + dragName, null).on(end + dragName, null);
-          dragRestore(dragged && d3.event.target === target);
-          dispatch({
-            type: "dragend"
+      }
+    }
+  }
+
+  return new Transition(groups, this._parents, name, id1);
+};
+
+var id = 0;
+
+function Transition(groups, parents, name, id) {
+  this._groups = groups;
+  this._parents = parents;
+  this._name = name;
+  this._id = id;
+}
+
+function transition(name) {
+  return selection().transition(name);
+}
+
+function newId() {
+  return ++id;
+}
+
+var selection_prototype = selection.prototype;
+
+Transition.prototype = transition.prototype = {
+  constructor: Transition,
+  select: transition_select,
+  selectAll: transition_selectAll,
+  filter: transition_filter,
+  merge: transition_merge,
+  selection: transition_selection,
+  transition: transition_transition,
+  call: selection_prototype.call,
+  nodes: selection_prototype.nodes,
+  node: selection_prototype.node,
+  size: selection_prototype.size,
+  empty: selection_prototype.empty,
+  each: selection_prototype.each,
+  on: transition_on,
+  attr: transition_attr,
+  attrTween: transition_attrTween,
+  style: transition_style,
+  styleTween: transition_styleTween,
+  text: transition_text,
+  remove: transition_remove,
+  tween: transition_tween,
+  delay: transition_delay,
+  duration: transition_duration,
+  ease: transition_ease
+};
+
+function linear$1(t) {
+  return +t;
+}
+
+function quadIn(t) {
+  return t * t;
+}
+
+function quadOut(t) {
+  return t * (2 - t);
+}
+
+function quadInOut(t) {
+  return ((t *= 2) <= 1 ? t * t : --t * (2 - t) + 1) / 2;
+}
+
+function cubicIn(t) {
+  return t * t * t;
+}
+
+function cubicOut(t) {
+  return --t * t * t + 1;
+}
+
+function cubicInOut(t) {
+  return ((t *= 2) <= 1 ? t * t * t : (t -= 2) * t * t + 2) / 2;
+}
+
+var exponent = 3;
+
+var polyIn = (function custom(e) {
+  e = +e;
+
+  function polyIn(t) {
+    return Math.pow(t, e);
+  }
+
+  polyIn.exponent = custom;
+
+  return polyIn;
+})(exponent);
+
+var polyOut = (function custom(e) {
+  e = +e;
+
+  function polyOut(t) {
+    return 1 - Math.pow(1 - t, e);
+  }
+
+  polyOut.exponent = custom;
+
+  return polyOut;
+})(exponent);
+
+var polyInOut = (function custom(e) {
+  e = +e;
+
+  function polyInOut(t) {
+    return ((t *= 2) <= 1 ? Math.pow(t, e) : 2 - Math.pow(2 - t, e)) / 2;
+  }
+
+  polyInOut.exponent = custom;
+
+  return polyInOut;
+})(exponent);
+
+var pi = Math.PI;
+var halfPi = pi / 2;
+
+function sinIn(t) {
+  return 1 - Math.cos(t * halfPi);
+}
+
+function sinOut(t) {
+  return Math.sin(t * halfPi);
+}
+
+function sinInOut(t) {
+  return (1 - Math.cos(pi * t)) / 2;
+}
+
+function expIn(t) {
+  return Math.pow(2, 10 * t - 10);
+}
+
+function expOut(t) {
+  return 1 - Math.pow(2, -10 * t);
+}
+
+function expInOut(t) {
+  return ((t *= 2) <= 1 ? Math.pow(2, 10 * t - 10) : 2 - Math.pow(2, 10 - 10 * t)) / 2;
+}
+
+function circleIn(t) {
+  return 1 - Math.sqrt(1 - t * t);
+}
+
+function circleOut(t) {
+  return Math.sqrt(1 - --t * t);
+}
+
+function circleInOut(t) {
+  return ((t *= 2) <= 1 ? 1 - Math.sqrt(1 - t * t) : Math.sqrt(1 - (t -= 2) * t) + 1) / 2;
+}
+
+var b1 = 4 / 11;
+var b2 = 6 / 11;
+var b3 = 8 / 11;
+var b4 = 3 / 4;
+var b5 = 9 / 11;
+var b6 = 10 / 11;
+var b7 = 15 / 16;
+var b8 = 21 / 22;
+var b9 = 63 / 64;
+var b0 = 1 / b1 / b1;
+
+function bounceIn(t) {
+  return 1 - bounceOut(1 - t);
+}
+
+function bounceOut(t) {
+  return (t = +t) < b1 ? b0 * t * t : t < b3 ? b0 * (t -= b2) * t + b4 : t < b6 ? b0 * (t -= b5) * t + b7 : b0 * (t -= b8) * t + b9;
+}
+
+function bounceInOut(t) {
+  return ((t *= 2) <= 1 ? 1 - bounceOut(1 - t) : bounceOut(t - 1) + 1) / 2;
+}
+
+var overshoot = 1.70158;
+
+var backIn = (function custom(s) {
+  s = +s;
+
+  function backIn(t) {
+    return t * t * ((s + 1) * t - s);
+  }
+
+  backIn.overshoot = custom;
+
+  return backIn;
+})(overshoot);
+
+var backOut = (function custom(s) {
+  s = +s;
+
+  function backOut(t) {
+    return --t * t * ((s + 1) * t + s) + 1;
+  }
+
+  backOut.overshoot = custom;
+
+  return backOut;
+})(overshoot);
+
+var backInOut = (function custom(s) {
+  s = +s;
+
+  function backInOut(t) {
+    return ((t *= 2) < 1 ? t * t * ((s + 1) * t - s) : (t -= 2) * t * ((s + 1) * t + s) + 2) / 2;
+  }
+
+  backInOut.overshoot = custom;
+
+  return backInOut;
+})(overshoot);
+
+var tau = 2 * Math.PI;
+var amplitude = 1;
+var period = 0.3;
+
+var elasticIn = (function custom(a, p) {
+  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);
+
+  function elasticIn(t) {
+    return a * Math.pow(2, 10 * --t) * Math.sin((s - t) / p);
+  }
+
+  elasticIn.amplitude = function(a) { return custom(a, p * tau); };
+  elasticIn.period = function(p) { return custom(a, p); };
+
+  return elasticIn;
+})(amplitude, period);
+
+var elasticOut = (function custom(a, p) {
+  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);
+
+  function elasticOut(t) {
+    return 1 - a * Math.pow(2, -10 * (t = +t)) * Math.sin((t + s) / p);
+  }
+
+  elasticOut.amplitude = function(a) { return custom(a, p * tau); };
+  elasticOut.period = function(p) { return custom(a, p); };
+
+  return elasticOut;
+})(amplitude, period);
+
+var elasticInOut = (function custom(a, p) {
+  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);
+
+  function elasticInOut(t) {
+    return ((t = t * 2 - 1) < 0
+        ? a * Math.pow(2, 10 * t) * Math.sin((s - t) / p)
+        : 2 - a * Math.pow(2, -10 * t) * Math.sin((s + t) / p)) / 2;
+  }
+
+  elasticInOut.amplitude = function(a) { return custom(a, p * tau); };
+  elasticInOut.period = function(p) { return custom(a, p); };
+
+  return elasticInOut;
+})(amplitude, period);
+
+var defaultTiming = {
+  time: null, // Set on use.
+  delay: 0,
+  duration: 250,
+  ease: cubicInOut
+};
+
+function inherit(node, id) {
+  var timing;
+  while (!(timing = node.__transition) || !(timing = timing[id])) {
+    if (!(node = node.parentNode)) {
+      return defaultTiming.time = now(), defaultTiming;
+    }
+  }
+  return timing;
+}
+
+var selection_transition = function(name) {
+  var id,
+      timing;
+
+  if (name instanceof Transition) {
+    id = name._id, name = name._name;
+  } else {
+    id = newId(), (timing = defaultTiming).time = now(), name = name == null ? null : name + "";
+  }
+
+  for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
+    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
+      if (node = group[i]) {
+        schedule(node, name, id, i, group, timing || inherit(node, id));
+      }
+    }
+  }
+
+  return new Transition(groups, this._parents, name, id);
+};
+
+selection.prototype.interrupt = selection_interrupt;
+selection.prototype.transition = selection_transition;
+
+var root$1 = [null];
+
+var active = function(node, name) {
+  var schedules = node.__transition,
+      schedule,
+      i;
+
+  if (schedules) {
+    name = name == null ? null : name + "";
+    for (i in schedules) {
+      if ((schedule = schedules[i]).state > SCHEDULED && schedule.name === name) {
+        return new Transition([[node]], root$1, name, +i);
+      }
+    }
+  }
+
+  return null;
+};
+
+var constant$4 = function(x) {
+  return function() {
+    return x;
+  };
+};
+
+var BrushEvent = function(target, type, selection) {
+  this.target = target;
+  this.type = type;
+  this.selection = selection;
+};
+
+function nopropagation$1() {
+  exports.event.stopImmediatePropagation();
+}
+
+var noevent$1 = function() {
+  exports.event.preventDefault();
+  exports.event.stopImmediatePropagation();
+};
+
+var MODE_DRAG = {name: "drag"};
+var MODE_SPACE = {name: "space"};
+var MODE_HANDLE = {name: "handle"};
+var MODE_CENTER = {name: "center"};
+
+var X = {
+  name: "x",
+  handles: ["e", "w"].map(type),
+  input: function(x, e) { return x && [[x[0], e[0][1]], [x[1], e[1][1]]]; },
+  output: function(xy) { return xy && [xy[0][0], xy[1][0]]; }
+};
+
+var Y = {
+  name: "y",
+  handles: ["n", "s"].map(type),
+  input: function(y, e) { return y && [[e[0][0], y[0]], [e[1][0], y[1]]]; },
+  output: function(xy) { return xy && [xy[0][1], xy[1][1]]; }
+};
+
+var XY = {
+  name: "xy",
+  handles: ["n", "e", "s", "w", "nw", "ne", "se", "sw"].map(type),
+  input: function(xy) { return xy; },
+  output: function(xy) { return xy; }
+};
+
+var cursors = {
+  overlay: "crosshair",
+  selection: "move",
+  n: "ns-resize",
+  e: "ew-resize",
+  s: "ns-resize",
+  w: "ew-resize",
+  nw: "nwse-resize",
+  ne: "nesw-resize",
+  se: "nwse-resize",
+  sw: "nesw-resize"
+};
+
+var flipX = {
+  e: "w",
+  w: "e",
+  nw: "ne",
+  ne: "nw",
+  se: "sw",
+  sw: "se"
+};
+
+var flipY = {
+  n: "s",
+  s: "n",
+  nw: "sw",
+  ne: "se",
+  se: "ne",
+  sw: "nw"
+};
+
+var signsX = {
+  overlay: +1,
+  selection: +1,
+  n: null,
+  e: +1,
+  s: null,
+  w: -1,
+  nw: -1,
+  ne: +1,
+  se: +1,
+  sw: -1
+};
+
+var signsY = {
+  overlay: +1,
+  selection: +1,
+  n: -1,
+  e: null,
+  s: +1,
+  w: null,
+  nw: -1,
+  ne: -1,
+  se: +1,
+  sw: +1
+};
+
+function type(t) {
+  return {type: t};
+}
+
+// Ignore right-click, since that should open the context menu.
+function defaultFilter() {
+  return !exports.event.button;
+}
+
+function defaultExtent() {
+  var svg = this.ownerSVGElement || this;
+  return [[0, 0], [svg.width.baseVal.value, svg.height.baseVal.value]];
+}
+
+// Like d3.local, but with the name “__brush” rather than auto-generated.
+function local$$1(node) {
+  while (!node.__brush) if (!(node = node.parentNode)) return;
+  return node.__brush;
+}
+
+function empty(extent) {
+  return extent[0][0] === extent[1][0]
+      || extent[0][1] === extent[1][1];
+}
+
+function brushSelection(node) {
+  var state = node.__brush;
+  return state ? state.dim.output(state.selection) : null;
+}
+
+function brushX() {
+  return brush$1(X);
+}
+
+function brushY() {
+  return brush$1(Y);
+}
+
+var brush = function() {
+  return brush$1(XY);
+};
+
+function brush$1(dim) {
+  var extent = defaultExtent,
+      filter = defaultFilter,
+      listeners = dispatch(brush, "start", "brush", "end"),
+      handleSize = 6,
+      touchending;
+
+  function brush(group) {
+    var overlay = group
+        .property("__brush", initialize)
+      .selectAll(".overlay")
+      .data([type("overlay")]);
+
+    overlay.enter().append("rect")
+        .attr("class", "overlay")
+        .attr("pointer-events", "all")
+        .attr("cursor", cursors.overlay)
+      .merge(overlay)
+        .each(function() {
+          var extent = local$$1(this).extent;
+          select(this)
+              .attr("x", extent[0][0])
+              .attr("y", extent[0][1])
+              .attr("width", extent[1][0] - extent[0][0])
+              .attr("height", extent[1][1] - extent[0][1]);
+        });
+
+    group.selectAll(".selection")
+      .data([type("selection")])
+      .enter().append("rect")
+        .attr("class", "selection")
+        .attr("cursor", cursors.selection)
+        .attr("fill", "#777")
+        .attr("fill-opacity", 0.3)
+        .attr("stroke", "#fff")
+        .attr("shape-rendering", "crispEdges");
+
+    var handle = group.selectAll(".handle")
+      .data(dim.handles, function(d) { return d.type; });
+
+    handle.exit().remove();
+
+    handle.enter().append("rect")
+        .attr("class", function(d) { return "handle handle--" + d.type; })
+        .attr("cursor", function(d) { return cursors[d.type]; });
+
+    group
+        .each(redraw)
+        .attr("fill", "none")
+        .attr("pointer-events", "all")
+        .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)")
+        .on("mousedown.brush touchstart.brush", started);
+  }
+
+  brush.move = function(group, selection$$1) {
+    if (group.selection) {
+      group
+          .on("start.brush", function() { emitter(this, arguments).beforestart().start(); })
+          .on("interrupt.brush end.brush", function() { emitter(this, arguments).end(); })
+          .tween("brush", function() {
+            var that = this,
+                state = that.__brush,
+                emit = emitter(that, arguments),
+                selection0 = state.selection,
+                selection1 = dim.input(typeof selection$$1 === "function" ? selection$$1.apply(this, arguments) : selection$$1, state.extent),
+                i = interpolateValue(selection0, selection1);
+
+            function tween(t) {
+              state.selection = t === 1 && empty(selection1) ? null : i(t);
+              redraw.call(that);
+              emit.brush();
+            }
+
+            return selection0 && selection1 ? tween : tween(1);
           });
-        }
-      };
-    }
-    drag.origin = function(x) {
-      if (!arguments.length) return origin;
-      origin = x;
-      return drag;
-    };
-    return d3.rebind(drag, event, "on");
-  };
-  function d3_behavior_dragTouchId() {
-    return d3.event.changedTouches[0].identifier;
-  }
-  function d3_behavior_dragTouchSubject() {
-    return d3.event.target;
-  }
-  function d3_behavior_dragMouseSubject() {
-    return d3_window;
-  }
-  var π = Math.PI, τ = 2 * π, halfπ = π / 2, ε = 1e-6, ε2 = ε * ε, d3_radians = π / 180, d3_degrees = 180 / π;
-  function d3_sgn(x) {
-    return x > 0 ? 1 : x < 0 ? -1 : 0;
-  }
-  function d3_cross2d(a, b, c) {
-    return (b[0] - a[0]) * (c[1] - a[1]) - (b[1] - a[1]) * (c[0] - a[0]);
-  }
-  function d3_acos(x) {
-    return x > 1 ? 0 : x < -1 ? π : Math.acos(x);
-  }
-  function d3_asin(x) {
-    return x > 1 ? halfπ : x < -1 ? -halfπ : Math.asin(x);
-  }
-  function d3_sinh(x) {
-    return ((x = Math.exp(x)) - 1 / x) / 2;
-  }
-  function d3_cosh(x) {
-    return ((x = Math.exp(x)) + 1 / x) / 2;
-  }
-  function d3_tanh(x) {
-    return ((x = Math.exp(2 * x)) - 1) / (x + 1);
-  }
-  function d3_haversin(x) {
-    return (x = Math.sin(x / 2)) * x;
-  }
-  var ρ = Math.SQRT2, ρ2 = 2, ρ4 = 4;
-  d3.interpolateZoom = function(p0, p1) {
-    var ux0 = p0[0], uy0 = p0[1], w0 = p0[2], ux1 = p1[0], uy1 = p1[1], w1 = p1[2];
-    var dx = ux1 - ux0, dy = uy1 - uy0, d2 = dx * dx + dy * dy, d1 = Math.sqrt(d2), b0 = (w1 * w1 - w0 * w0 + ρ4 * d2) / (2 * w0 * ρ2 * d1), b1 = (w1 * w1 - w0 * w0 - ρ4 * d2) / (2 * w1 * ρ2 * d1), r0 = Math.log(Math.sqrt(b0 * b0 + 1) - b0), r1 = Math.log(Math.sqrt(b1 * b1 + 1) - b1), dr = r1 - r0, S = (dr || Math.log(w1 / w0)) / ρ;
-    function interpolate(t) {
-      var s = t * S;
-      if (dr) {
-        var coshr0 = d3_cosh(r0), u = w0 / (ρ2 * d1) * (coshr0 * d3_tanh(ρ * s + r0) - d3_sinh(r0));
-        return [ ux0 + u * dx, uy0 + u * dy, w0 * coshr0 / d3_cosh(ρ * s + r0) ];
-      }
-      return [ ux0 + t * dx, uy0 + t * dy, w0 * Math.exp(ρ * s) ];
-    }
-    interpolate.duration = S * 1e3;
-    return interpolate;
-  };
-  d3.behavior.zoom = function() {
-    var view = {
-      x: 0,
-      y: 0,
-      k: 1
-    }, translate0, center0, center, size = [ 960, 500 ], scaleExtent = d3_behavior_zoomInfinity, mousedown = "mousedown.zoom", mousemove = "mousemove.zoom", mouseup = "mouseup.zoom", mousewheelTimer, touchstart = "touchstart.zoom", touchtime, event = d3_eventDispatch(zoom, "zoomstart", "zoom", "zoomend"), x0, x1, y0, y1;
-    function zoom(g) {
-      g.on(mousedown, mousedowned).on(d3_behavior_zoomWheel + ".zoom", mousewheeled).on("dblclick.zoom", dblclicked).on(touchstart, touchstarted);
-    }
-    zoom.event = function(g) {
-      g.each(function() {
-        var dispatch = event.of(this, arguments), view1 = view;
-        if (d3_transitionInheritId) {
-          d3.select(this).transition().each("start.zoom", function() {
-            view = this.__chart__ || {
-              x: 0,
-              y: 0,
-              k: 1
-            };
-            zoomstarted(dispatch);
-          }).tween("zoom:zoom", function() {
-            var dx = size[0], dy = size[1], cx = dx / 2, cy = dy / 2, i = d3.interpolateZoom([ (cx - view.x) / view.k, (cy - view.y) / view.k, dx / view.k ], [ (cx - view1.x) / view1.k, (cy - view1.y) / view1.k, dx / view1.k ]);
-            return function(t) {
-              var l = i(t), k = dx / l[2];
-              this.__chart__ = view = {
-                x: cx - l[0] * k,
-                y: cy - l[1] * k,
-                k: k
-              };
-              zoomed(dispatch);
-            };
-          }).each("end.zoom", function() {
-            zoomended(dispatch);
+    } else {
+      group
+          .each(function() {
+            var that = this,
+                args = arguments,
+                state = that.__brush,
+                selection1 = dim.input(typeof selection$$1 === "function" ? selection$$1.apply(that, args) : selection$$1, state.extent),
+                emit = emitter(that, args).beforestart();
+
+            interrupt(that);
+            state.selection = selection1 == null || empty(selection1) ? null : selection1;
+            redraw.call(that);
+            emit.start().brush().end();
           });
-        } else {
-          this.__chart__ = view;
-          zoomstarted(dispatch);
-          zoomed(dispatch);
-          zoomended(dispatch);
-        }
-      });
-    };
-    zoom.translate = function(_) {
-      if (!arguments.length) return [ view.x, view.y ];
-      view = {
-        x: +_[0],
-        y: +_[1],
-        k: view.k
-      };
-      rescale();
-      return zoom;
-    };
-    zoom.scale = function(_) {
-      if (!arguments.length) return view.k;
-      view = {
-        x: view.x,
-        y: view.y,
-        k: +_
-      };
-      rescale();
-      return zoom;
-    };
-    zoom.scaleExtent = function(_) {
-      if (!arguments.length) return scaleExtent;
-      scaleExtent = _ == null ? d3_behavior_zoomInfinity : [ +_[0], +_[1] ];
-      return zoom;
-    };
-    zoom.center = function(_) {
-      if (!arguments.length) return center;
-      center = _ && [ +_[0], +_[1] ];
-      return zoom;
-    };
-    zoom.size = function(_) {
-      if (!arguments.length) return size;
-      size = _ && [ +_[0], +_[1] ];
-      return zoom;
-    };
-    zoom.x = function(z) {
-      if (!arguments.length) return x1;
-      x1 = z;
-      x0 = z.copy();
-      view = {
-        x: 0,
-        y: 0,
-        k: 1
-      };
-      return zoom;
-    };
-    zoom.y = function(z) {
-      if (!arguments.length) return y1;
-      y1 = z;
-      y0 = z.copy();
-      view = {
-        x: 0,
-        y: 0,
-        k: 1
-      };
-      return zoom;
-    };
-    function location(p) {
-      return [ (p[0] - view.x) / view.k, (p[1] - view.y) / view.k ];
-    }
-    function point(l) {
-      return [ l[0] * view.k + view.x, l[1] * view.k + view.y ];
-    }
-    function scaleTo(s) {
-      view.k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], s));
-    }
-    function translateTo(p, l) {
-      l = point(l);
-      view.x += p[0] - l[0];
-      view.y += p[1] - l[1];
-    }
-    function rescale() {
-      if (x1) x1.domain(x0.range().map(function(x) {
-        return (x - view.x) / view.k;
-      }).map(x0.invert));
-      if (y1) y1.domain(y0.range().map(function(y) {
-        return (y - view.y) / view.k;
-      }).map(y0.invert));
-    }
-    function zoomstarted(dispatch) {
-      dispatch({
-        type: "zoomstart"
-      });
-    }
-    function zoomed(dispatch) {
-      rescale();
-      dispatch({
-        type: "zoom",
-        scale: view.k,
-        translate: [ view.x, view.y ]
-      });
-    }
-    function zoomended(dispatch) {
-      dispatch({
-        type: "zoomend"
-      });
-    }
-    function mousedowned() {
-      var that = this, target = d3.event.target, dispatch = event.of(that, arguments), dragged = 0, subject = d3.select(d3_window).on(mousemove, moved).on(mouseup, ended), location0 = location(d3.mouse(that)), dragRestore = d3_event_dragSuppress();
-      d3_selection_interrupt.call(that);
-      zoomstarted(dispatch);
-      function moved() {
-        dragged = 1;
-        translateTo(d3.mouse(that), location0);
-        zoomed(dispatch);
-      }
-      function ended() {
-        subject.on(mousemove, null).on(mouseup, null);
-        dragRestore(dragged && d3.event.target === target);
-        zoomended(dispatch);
-      }
-    }
-    function touchstarted() {
-      var that = this, dispatch = event.of(that, arguments), locations0 = {}, distance0 = 0, scale0, zoomName = ".zoom-" + d3.event.changedTouches[0].identifier, touchmove = "touchmove" + zoomName, touchend = "touchend" + zoomName, targets = [], subject = d3.select(that).on(mousedown, null).on(touchstart, started), dragRestore = d3_event_dragSuppress();
-      d3_selection_interrupt.call(that);
-      started();
-      zoomstarted(dispatch);
-      function relocate() {
-        var touches = d3.touches(that);
-        scale0 = view.k;
-        touches.forEach(function(t) {
-          if (t.identifier in locations0) locations0[t.identifier] = location(t);
-        });
-        return touches;
-      }
-      function started() {
-        var target = d3.event.target;
-        d3.select(target).on(touchmove, moved).on(touchend, ended);
-        targets.push(target);
-        var changed = d3.event.changedTouches;
-        for (var i = 0, n = changed.length; i < n; ++i) {
-          locations0[changed[i].identifier] = null;
-        }
-        var touches = relocate(), now = Date.now();
-        if (touches.length === 1) {
-          if (now - touchtime < 500) {
-            var p = touches[0], l = locations0[p.identifier];
-            scaleTo(view.k * 2);
-            translateTo(p, l);
-            d3_eventPreventDefault();
-            zoomed(dispatch);
+    }
+  };
+
+  function redraw() {
+    var group = select(this),
+        selection$$1 = local$$1(this).selection;
+
+    if (selection$$1) {
+      group.selectAll(".selection")
+          .style("display", null)
+          .attr("x", selection$$1[0][0])
+          .attr("y", selection$$1[0][1])
+          .attr("width", selection$$1[1][0] - selection$$1[0][0])
+          .attr("height", selection$$1[1][1] - selection$$1[0][1]);
+
+      group.selectAll(".handle")
+          .style("display", null)
+          .attr("x", function(d) { return d.type[d.type.length - 1] === "e" ? selection$$1[1][0] - handleSize / 2 : selection$$1[0][0] - handleSize / 2; })
+          .attr("y", function(d) { return d.type[0] === "s" ? selection$$1[1][1] - handleSize / 2 : selection$$1[0][1] - handleSize / 2; })
+          .attr("width", function(d) { return d.type === "n" || d.type === "s" ? selection$$1[1][0] - selection$$1[0][0] + handleSize : handleSize; })
+          .attr("height", function(d) { return d.type === "e" || d.type === "w" ? selection$$1[1][1] - selection$$1[0][1] + handleSize : handleSize; });
+    }
+
+    else {
+      group.selectAll(".selection,.handle")
+          .style("display", "none")
+          .attr("x", null)
+          .attr("y", null)
+          .attr("width", null)
+          .attr("height", null);
+    }
+  }
+
+  function emitter(that, args) {
+    return that.__brush.emitter || new Emitter(that, args);
+  }
+
+  function Emitter(that, args) {
+    this.that = that;
+    this.args = args;
+    this.state = that.__brush;
+    this.active = 0;
+  }
+
+  Emitter.prototype = {
+    beforestart: function() {
+      if (++this.active === 1) this.state.emitter = this, this.starting = true;
+      return this;
+    },
+    start: function() {
+      if (this.starting) this.starting = false, this.emit("start");
+      return this;
+    },
+    brush: function() {
+      this.emit("brush");
+      return this;
+    },
+    end: function() {
+      if (--this.active === 0) delete this.state.emitter, this.emit("end");
+      return this;
+    },
+    emit: function(type) {
+      customEvent(new BrushEvent(brush, type, dim.output(this.state.selection)), listeners.apply, listeners, [type, this.that, this.args]);
+    }
+  };
+
+  function started() {
+    if (exports.event.touches) { if (exports.event.changedTouches.length < exports.event.touches.length) return noevent$1(); }
+    else if (touchending) return;
+    if (!filter.apply(this, arguments)) return;
+
+    var that = this,
+        type = exports.event.target.__data__.type,
+        mode = (exports.event.metaKey ? type = "overlay" : type) === "selection" ? MODE_DRAG : (exports.event.altKey ? MODE_CENTER : MODE_HANDLE),
+        signX = dim === Y ? null : signsX[type],
+        signY = dim === X ? null : signsY[type],
+        state = local$$1(that),
+        extent = state.extent,
+        selection$$1 = state.selection,
+        W = extent[0][0], w0, w1,
+        N = extent[0][1], n0, n1,
+        E = extent[1][0], e0, e1,
+        S = extent[1][1], s0, s1,
+        dx,
+        dy,
+        moving,
+        shifting = signX && signY && exports.event.shiftKey,
+        lockX,
+        lockY,
+        point0 = mouse(that),
+        point = point0,
+        emit = emitter(that, arguments).beforestart();
+
+    if (type === "overlay") {
+      state.selection = selection$$1 = [
+        [w0 = dim === Y ? W : point0[0], n0 = dim === X ? N : point0[1]],
+        [e0 = dim === Y ? E : w0, s0 = dim === X ? S : n0]
+      ];
+    } else {
+      w0 = selection$$1[0][0];
+      n0 = selection$$1[0][1];
+      e0 = selection$$1[1][0];
+      s0 = selection$$1[1][1];
+    }
+
+    w1 = w0;
+    n1 = n0;
+    e1 = e0;
+    s1 = s0;
+
+    var group = select(that)
+        .attr("pointer-events", "none");
+
+    var overlay = group.selectAll(".overlay")
+        .attr("cursor", cursors[type]);
+
+    if (exports.event.touches) {
+      group
+          .on("touchmove.brush", moved, true)
+          .on("touchend.brush touchcancel.brush", ended, true);
+    } else {
+      var view = select(exports.event.view)
+          .on("keydown.brush", keydowned, true)
+          .on("keyup.brush", keyupped, true)
+          .on("mousemove.brush", moved, true)
+          .on("mouseup.brush", ended, true);
+
+      dragDisable(exports.event.view);
+    }
+
+    nopropagation$1();
+    interrupt(that);
+    redraw.call(that);
+    emit.start();
+
+    function moved() {
+      var point1 = mouse(that);
+      if (shifting && !lockX && !lockY) {
+        if (Math.abs(point1[0] - point[0]) > Math.abs(point1[1] - point[1])) lockY = true;
+        else lockX = true;
+      }
+      point = point1;
+      moving = true;
+      noevent$1();
+      move();
+    }
+
+    function move() {
+      var t;
+
+      dx = point[0] - point0[0];
+      dy = point[1] - point0[1];
+
+      switch (mode) {
+        case MODE_SPACE:
+        case MODE_DRAG: {
+          if (signX) dx = Math.max(W - w0, Math.min(E - e0, dx)), w1 = w0 + dx, e1 = e0 + dx;
+          if (signY) dy = Math.max(N - n0, Math.min(S - s0, dy)), n1 = n0 + dy, s1 = s0 + dy;
+          break;
+        }
+        case MODE_HANDLE: {
+          if (signX < 0) dx = Math.max(W - w0, Math.min(E - w0, dx)), w1 = w0 + dx, e1 = e0;
+          else if (signX > 0) dx = Math.max(W - e0, Math.min(E - e0, dx)), w1 = w0, e1 = e0 + dx;
+          if (signY < 0) dy = Math.max(N - n0, Math.min(S - n0, dy)), n1 = n0 + dy, s1 = s0;
+          else if (signY > 0) dy = Math.max(N - s0, Math.min(S - s0, dy)), n1 = n0, s1 = s0 + dy;
+          break;
+        }
+        case MODE_CENTER: {
+          if (signX) w1 = Math.max(W, Math.min(E, w0 - dx * signX)), e1 = Math.max(W, Math.min(E, e0 + dx * signX));
+          if (signY) n1 = Math.max(N, Math.min(S, n0 - dy * signY)), s1 = Math.max(N, Math.min(S, s0 + dy * signY));
+          break;
+        }
+      }
+
+      if (e1 < w1) {
+        signX *= -1;
+        t = w0, w0 = e0, e0 = t;
+        t = w1, w1 = e1, e1 = t;
+        if (type in flipX) overlay.attr("cursor", cursors[type = flipX[type]]);
+      }
+
+      if (s1 < n1) {
+        signY *= -1;
+        t = n0, n0 = s0, s0 = t;
+        t = n1, n1 = s1, s1 = t;
+        if (type in flipY) overlay.attr("cursor", cursors[type = flipY[type]]);
+      }
+
+      if (state.selection) selection$$1 = state.selection; // May be set by brush.move!
+      if (lockX) w1 = selection$$1[0][0], e1 = selection$$1[1][0];
+      if (lockY) n1 = selection$$1[0][1], s1 = selection$$1[1][1];
+
+      if (selection$$1[0][0] !== w1
+          || selection$$1[0][1] !== n1
+          || selection$$1[1][0] !== e1
+          || selection$$1[1][1] !== s1) {
+        state.selection = [[w1, n1], [e1, s1]];
+        redraw.call(that);
+        emit.brush();
+      }
+    }
+
+    function ended() {
+      nopropagation$1();
+      if (exports.event.touches) {
+        if (exports.event.touches.length) return;
+        if (touchending) clearTimeout(touchending);
+        touchending = setTimeout(function() { touchending = null; }, 500); // Ghost clicks are delayed!
+        group.on("touchmove.brush touchend.brush touchcancel.brush", null);
+      } else {
+        yesdrag(exports.event.view, moving);
+        view.on("keydown.brush keyup.brush mousemove.brush mouseup.brush", null);
+      }
+      group.attr("pointer-events", "all");
+      overlay.attr("cursor", cursors.overlay);
+      if (state.selection) selection$$1 = state.selection; // May be set by brush.move (on start)!
+      if (empty(selection$$1)) state.selection = null, redraw.call(that);
+      emit.end();
+    }
+
+    function keydowned() {
+      switch (exports.event.keyCode) {
+        case 16: { // SHIFT
+          shifting = signX && signY;
+          break;
+        }
+        case 18: { // ALT
+          if (mode === MODE_HANDLE) {
+            if (signX) e0 = e1 - dx * signX, w0 = w1 + dx * signX;
+            if (signY) s0 = s1 - dy * signY, n0 = n1 + dy * signY;
+            mode = MODE_CENTER;
+            move();
           }
-          touchtime = now;
-        } else if (touches.length > 1) {
-          var p = touches[0], q = touches[1], dx = p[0] - q[0], dy = p[1] - q[1];
-          distance0 = dx * dx + dy * dy;
-        }
-      }
-      function moved() {
-        var touches = d3.touches(that), p0, l0, p1, l1;
-        for (var i = 0, n = touches.length; i < n; ++i, l1 = null) {
-          p1 = touches[i];
-          if (l1 = locations0[p1.identifier]) {
-            if (l0) break;
-            p0 = p1, l0 = l1;
+          break;
+        }
+        case 32: { // SPACE; takes priority over ALT
+          if (mode === MODE_HANDLE || mode === MODE_CENTER) {
+            if (signX < 0) e0 = e1 - dx; else if (signX > 0) w0 = w1 - dx;
+            if (signY < 0) s0 = s1 - dy; else if (signY > 0) n0 = n1 - dy;
+            mode = MODE_SPACE;
+            overlay.attr("cursor", cursors.selection);
+            move();
+          }
+          break;
+        }
+        default: return;
+      }
+      noevent$1();
+    }
+
+    function keyupped() {
+      switch (exports.event.keyCode) {
+        case 16: { // SHIFT
+          if (shifting) {
+            lockX = lockY = shifting = false;
+            move();
+          }
+          break;
+        }
+        case 18: { // ALT
+          if (mode === MODE_CENTER) {
+            if (signX < 0) e0 = e1; else if (signX > 0) w0 = w1;
+            if (signY < 0) s0 = s1; else if (signY > 0) n0 = n1;
+            mode = MODE_HANDLE;
+            move();
+          }
+          break;
+        }
+        case 32: { // SPACE
+          if (mode === MODE_SPACE) {
+            if (exports.event.altKey) {
+              if (signX) e0 = e1 - dx * signX, w0 = w1 + dx * signX;
+              if (signY) s0 = s1 - dy * signY, n0 = n1 + dy * signY;
+              mode = MODE_CENTER;
+            } else {
+              if (signX < 0) e0 = e1; else if (signX > 0) w0 = w1;
+              if (signY < 0) s0 = s1; else if (signY > 0) n0 = n1;
+              mode = MODE_HANDLE;
+            }
+            overlay.attr("cursor", cursors[type]);
+            move();
           }
-        }
-        if (l1) {
-          var distance1 = (distance1 = p1[0] - p0[0]) * distance1 + (distance1 = p1[1] - p0[1]) * distance1, scale1 = distance0 && Math.sqrt(distance1 / distance0);
-          p0 = [ (p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2 ];
-          l0 = [ (l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2 ];
-          scaleTo(scale1 * scale0);
-        }
-        touchtime = null;
-        translateTo(p0, l0);
-        zoomed(dispatch);
-      }
-      function ended() {
-        if (d3.event.touches.length) {
-          var changed = d3.event.changedTouches;
-          for (var i = 0, n = changed.length; i < n; ++i) {
-            delete locations0[changed[i].identifier];
-          }
-          for (var identifier in locations0) {
-            return void relocate();
+          break;
+        }
+        default: return;
+      }
+      noevent$1();
+    }
+  }
+
+  function initialize() {
+    var state = this.__brush || {selection: null};
+    state.extent = extent.apply(this, arguments);
+    state.dim = dim;
+    return state;
+  }
+
+  brush.extent = function(_) {
+    return arguments.length ? (extent = typeof _ === "function" ? _ : constant$4([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), brush) : extent;
+  };
+
+  brush.filter = function(_) {
+    return arguments.length ? (filter = typeof _ === "function" ? _ : constant$4(!!_), brush) : filter;
+  };
+
+  brush.handleSize = function(_) {
+    return arguments.length ? (handleSize = +_, brush) : handleSize;
+  };
+
+  brush.on = function() {
+    var value = listeners.on.apply(listeners, arguments);
+    return value === listeners ? brush : value;
+  };
+
+  return brush;
+}
+
+var cos = Math.cos;
+var sin = Math.sin;
+var pi$1 = Math.PI;
+var halfPi$1 = pi$1 / 2;
+var tau$1 = pi$1 * 2;
+var max$1 = Math.max;
+
+function compareValue(compare) {
+  return function(a, b) {
+    return compare(
+      a.source.value + a.target.value,
+      b.source.value + b.target.value
+    );
+  };
+}
+
+var chord = function() {
+  var padAngle = 0,
+      sortGroups = null,
+      sortSubgroups = null,
+      sortChords = null;
+
+  function chord(matrix) {
+    var n = matrix.length,
+        groupSums = [],
+        groupIndex = sequence(n),
+        subgroupIndex = [],
+        chords = [],
+        groups = chords.groups = new Array(n),
+        subgroups = new Array(n * n),
+        k,
+        x,
+        x0,
+        dx,
+        i,
+        j;
+
+    // Compute the sum.
+    k = 0, i = -1; while (++i < n) {
+      x = 0, j = -1; while (++j < n) {
+        x += matrix[i][j];
+      }
+      groupSums.push(x);
+      subgroupIndex.push(sequence(n));
+      k += x;
+    }
+
+    // Sort groups…
+    if (sortGroups) groupIndex.sort(function(a, b) {
+      return sortGroups(groupSums[a], groupSums[b]);
+    });
+
+    // Sort subgroups…
+    if (sortSubgroups) subgroupIndex.forEach(function(d, i) {
+      d.sort(function(a, b) {
+        return sortSubgroups(matrix[i][a], matrix[i][b]);
+      });
+    });
+
+    // Convert the sum to scaling factor for [0, 2pi].
+    // TODO Allow start and end angle to be specified?
+    // TODO Allow padding to be specified as percentage?
+    k = max$1(0, tau$1 - padAngle * n) / k;
+    dx = k ? padAngle : tau$1 / n;
+
+    // Compute the start and end angle for each group and subgroup.
+    // Note: Opera has a bug reordering object literal properties!
+    x = 0, i = -1; while (++i < n) {
+      x0 = x, j = -1; while (++j < n) {
+        var di = groupIndex[i],
+            dj = subgroupIndex[di][j],
+            v = matrix[di][dj],
+            a0 = x,
+            a1 = x += v * k;
+        subgroups[dj * n + di] = {
+          index: di,
+          subindex: dj,
+          startAngle: a0,
+          endAngle: a1,
+          value: v
+        };
+      }
+      groups[di] = {
+        index: di,
+        startAngle: x0,
+        endAngle: x,
+        value: groupSums[di]
+      };
+      x += dx;
+    }
+
+    // Generate chords for each (non-empty) subgroup-subgroup link.
+    i = -1; while (++i < n) {
+      j = i - 1; while (++j < n) {
+        var source = subgroups[j * n + i],
+            target = subgroups[i * n + j];
+        if (source.value || target.value) {
+          chords.push(source.value < target.value
+              ? {source: target, target: source}
+              : {source: source, target: target});
+        }
+      }
+    }
+
+    return sortChords ? chords.sort(sortChords) : chords;
+  }
+
+  chord.padAngle = function(_) {
+    return arguments.length ? (padAngle = max$1(0, _), chord) : padAngle;
+  };
+
+  chord.sortGroups = function(_) {
+    return arguments.length ? (sortGroups = _, chord) : sortGroups;
+  };
+
+  chord.sortSubgroups = function(_) {
+    return arguments.length ? (sortSubgroups = _, chord) : sortSubgroups;
+  };
+
+  chord.sortChords = function(_) {
+    return arguments.length ? (_ == null ? sortChords = null : (sortChords = compareValue(_))._ = _, chord) : sortChords && sortChords._;
+  };
+
+  return chord;
+};
+
+var slice$2 = Array.prototype.slice;
+
+var constant$5 = function(x) {
+  return function() {
+    return x;
+  };
+};
+
+var pi$2 = Math.PI;
+var tau$2 = 2 * pi$2;
+var epsilon$1 = 1e-6;
+var tauEpsilon = tau$2 - epsilon$1;
+
+function Path() {
+  this._x0 = this._y0 = // start of current subpath
+  this._x1 = this._y1 = null; // end of current subpath
+  this._ = "";
+}
+
+function path() {
+  return new Path;
+}
+
+Path.prototype = path.prototype = {
+  constructor: Path,
+  moveTo: function(x, y) {
+    this._ += "M" + (this._x0 = this._x1 = +x) + "," + (this._y0 = this._y1 = +y);
+  },
+  closePath: function() {
+    if (this._x1 !== null) {
+      this._x1 = this._x0, this._y1 = this._y0;
+      this._ += "Z";
+    }
+  },
+  lineTo: function(x, y) {
+    this._ += "L" + (this._x1 = +x) + "," + (this._y1 = +y);
+  },
+  quadraticCurveTo: function(x1, y1, x, y) {
+    this._ += "Q" + (+x1) + "," + (+y1) + "," + (this._x1 = +x) + "," + (this._y1 = +y);
+  },
+  bezierCurveTo: function(x1, y1, x2, y2, x, y) {
+    this._ += "C" + (+x1) + "," + (+y1) + "," + (+x2) + "," + (+y2) + "," + (this._x1 = +x) + "," + (this._y1 = +y);
+  },
+  arcTo: function(x1, y1, x2, y2, r) {
+    x1 = +x1, y1 = +y1, x2 = +x2, y2 = +y2, r = +r;
+    var x0 = this._x1,
+        y0 = this._y1,
+        x21 = x2 - x1,
+        y21 = y2 - y1,
+        x01 = x0 - x1,
+        y01 = y0 - y1,
+        l01_2 = x01 * x01 + y01 * y01;
+
+    // Is the radius negative? Error.
+    if (r < 0) throw new Error("negative radius: " + r);
+
+    // Is this path empty? Move to (x1,y1).
+    if (this._x1 === null) {
+      this._ += "M" + (this._x1 = x1) + "," + (this._y1 = y1);
+    }
+
+    // Or, is (x1,y1) coincident with (x0,y0)? Do nothing.
+    else if (!(l01_2 > epsilon$1)) {}
+
+    // Or, are (x0,y0), (x1,y1) and (x2,y2) collinear?
+    // Equivalently, is (x1,y1) coincident with (x2,y2)?
+    // Or, is the radius zero? Line to (x1,y1).
+    else if (!(Math.abs(y01 * x21 - y21 * x01) > epsilon$1) || !r) {
+      this._ += "L" + (this._x1 = x1) + "," + (this._y1 = y1);
+    }
+
+    // Otherwise, draw an arc!
+    else {
+      var x20 = x2 - x0,
+          y20 = y2 - y0,
+          l21_2 = x21 * x21 + y21 * y21,
+          l20_2 = x20 * x20 + y20 * y20,
+          l21 = Math.sqrt(l21_2),
+          l01 = Math.sqrt(l01_2),
+          l = r * Math.tan((pi$2 - Math.acos((l21_2 + l01_2 - l20_2) / (2 * l21 * l01))) / 2),
+          t01 = l / l01,
+          t21 = l / l21;
+
+      // If the start tangent is not coincident with (x0,y0), line to.
+      if (Math.abs(t01 - 1) > epsilon$1) {
+        this._ += "L" + (x1 + t01 * x01) + "," + (y1 + t01 * y01);
+      }
+
+      this._ += "A" + r + "," + r + ",0,0," + (+(y01 * x20 > x01 * y20)) + "," + (this._x1 = x1 + t21 * x21) + "," + (this._y1 = y1 + t21 * y21);
+    }
+  },
+  arc: function(x, y, r, a0, a1, ccw) {
+    x = +x, y = +y, r = +r;
+    var dx = r * Math.cos(a0),
+        dy = r * Math.sin(a0),
+        x0 = x + dx,
+        y0 = y + dy,
+        cw = 1 ^ ccw,
+        da = ccw ? a0 - a1 : a1 - a0;
+
+    // Is the radius negative? Error.
+    if (r < 0) throw new Error("negative radius: " + r);
+
+    // Is this path empty? Move to (x0,y0).
+    if (this._x1 === null) {
+      this._ += "M" + x0 + "," + y0;
+    }
+
+    // Or, is (x0,y0) not coincident with the previous point? Line to (x0,y0).
+    else if (Math.abs(this._x1 - x0) > epsilon$1 || Math.abs(this._y1 - y0) > epsilon$1) {
+      this._ += "L" + x0 + "," + y0;
+    }
+
+    // Is this arc empty? We’re done.
+    if (!r) return;
+
+    // Does the angle go the wrong way? Flip the direction.
+    if (da < 0) da = da % tau$2 + tau$2;
+
+    // Is this a complete circle? Draw two arcs to complete the circle.
+    if (da > tauEpsilon) {
+      this._ += "A" + r + "," + r + ",0,1," + cw + "," + (x - dx) + "," + (y - dy) + "A" + r + "," + r + ",0,1," + cw + "," + (this._x1 = x0) + "," + (this._y1 = y0);
+    }
+
+    // Is this arc non-empty? Draw an arc!
+    else if (da > epsilon$1) {
+      this._ += "A" + r + "," + r + ",0," + (+(da >= pi$2)) + "," + cw + "," + (this._x1 = x + r * Math.cos(a1)) + "," + (this._y1 = y + r * Math.sin(a1));
+    }
+  },
+  rect: function(x, y, w, h) {
+    this._ += "M" + (this._x0 = this._x1 = +x) + "," + (this._y0 = this._y1 = +y) + "h" + (+w) + "v" + (+h) + "h" + (-w) + "Z";
+  },
+  toString: function() {
+    return this._;
+  }
+};
+
+function defaultSource(d) {
+  return d.source;
+}
+
+function defaultTarget(d) {
+  return d.target;
+}
+
+function defaultRadius(d) {
+  return d.radius;
+}
+
+function defaultStartAngle(d) {
+  return d.startAngle;
+}
+
+function defaultEndAngle(d) {
+  return d.endAngle;
+}
+
+var ribbon = function() {
+  var source = defaultSource,
+      target = defaultTarget,
+      radius = defaultRadius,
+      startAngle = defaultStartAngle,
+      endAngle = defaultEndAngle,
+      context = null;
+
+  function ribbon() {
+    var buffer,
+        argv = slice$2.call(arguments),
+        s = source.apply(this, argv),
+        t = target.apply(this, argv),
+        sr = +radius.apply(this, (argv[0] = s, argv)),
+        sa0 = startAngle.apply(this, argv) - halfPi$1,
+        sa1 = endAngle.apply(this, argv) - halfPi$1,
+        sx0 = sr * cos(sa0),
+        sy0 = sr * sin(sa0),
+        tr = +radius.apply(this, (argv[0] = t, argv)),
+        ta0 = startAngle.apply(this, argv) - halfPi$1,
+        ta1 = endAngle.apply(this, argv) - halfPi$1;
+
+    if (!context) context = buffer = path();
+
+    context.moveTo(sx0, sy0);
+    context.arc(0, 0, sr, sa0, sa1);
+    if (sa0 !== ta0 || sa1 !== ta1) { // TODO sr !== tr?
+      context.quadraticCurveTo(0, 0, tr * cos(ta0), tr * sin(ta0));
+      context.arc(0, 0, tr, ta0, ta1);
+    }
+    context.quadraticCurveTo(0, 0, sx0, sy0);
+    context.closePath();
+
+    if (buffer) return context = null, buffer + "" || null;
+  }
+
+  ribbon.radius = function(_) {
+    return arguments.length ? (radius = typeof _ === "function" ? _ : constant$5(+_), ribbon) : radius;
+  };
+
+  ribbon.startAngle = function(_) {
+    return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant$5(+_), ribbon) : startAngle;
+  };
+
+  ribbon.endAngle = function(_) {
+    return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant$5(+_), ribbon) : endAngle;
+  };
+
+  ribbon.source = function(_) {
+    return arguments.length ? (source = _, ribbon) : source;
+  };
+
+  ribbon.target = function(_) {
+    return arguments.length ? (target = _, ribbon) : target;
+  };
+
+  ribbon.context = function(_) {
+    return arguments.length ? ((context = _ == null ? null : _), ribbon) : context;
+  };
+
+  return ribbon;
+};
+
+var prefix = "$";
+
+function Map() {}
+
+Map.prototype = map$1.prototype = {
+  constructor: Map,
+  has: function(key) {
+    return (prefix + key) in this;
+  },
+  get: function(key) {
+    return this[prefix + key];
+  },
+  set: function(key, value) {
+    this[prefix + key] = value;
+    return this;
+  },
+  remove: function(key) {
+    var property = prefix + key;
+    return property in this && delete this[property];
+  },
+  clear: function() {
+    for (var property in this) if (property[0] === prefix) delete this[property];
+  },
+  keys: function() {
+    var keys = [];
+    for (var property in this) if (property[0] === prefix) keys.push(property.slice(1));
+    return keys;
+  },
+  values: function() {
+    var values = [];
+    for (var property in this) if (property[0] === prefix) values.push(this[property]);
+    return values;
+  },
+  entries: function() {
+    var entries = [];
+    for (var property in this) if (property[0] === prefix) entries.push({key: property.slice(1), value: this[property]});
+    return entries;
+  },
+  size: function() {
+    var size = 0;
+    for (var property in this) if (property[0] === prefix) ++size;
+    return size;
+  },
+  empty: function() {
+    for (var property in this) if (property[0] === prefix) return false;
+    return true;
+  },
+  each: function(f) {
+    for (var property in this) if (property[0] === prefix) f(this[property], property.slice(1), this);
+  }
+};
+
+function map$1(object, f) {
+  var map = new Map;
+
+  // Copy constructor.
+  if (object instanceof Map) object.each(function(value, key) { map.set(key, value); });
+
+  // Index array by numeric index or specified key function.
+  else if (Array.isArray(object)) {
+    var i = -1,
+        n = object.length,
+        o;
+
+    if (f == null) while (++i < n) map.set(i, object[i]);
+    else while (++i < n) map.set(f(o = object[i], i, object), o);
+  }
+
+  // Convert object to map.
+  else if (object) for (var key in object) map.set(key, object[key]);
+
+  return map;
+}
+
+var nest = function() {
+  var keys = [],
+      sortKeys = [],
+      sortValues,
+      rollup,
+      nest;
+
+  function apply(array, depth, createResult, setResult) {
+    if (depth >= keys.length) return rollup != null
+        ? rollup(array) : (sortValues != null
+        ? array.sort(sortValues)
+        : array);
+
+    var i = -1,
+        n = array.length,
+        key = keys[depth++],
+        keyValue,
+        value,
+        valuesByKey = map$1(),
+        values,
+        result = createResult();
+
+    while (++i < n) {
+      if (values = valuesByKey.get(keyValue = key(value = array[i]) + "")) {
+        values.push(value);
+      } else {
+        valuesByKey.set(keyValue, [value]);
+      }
+    }
+
+    valuesByKey.each(function(values, key) {
+      setResult(result, key, apply(values, depth, createResult, setResult));
+    });
+
+    return result;
+  }
+
+  function entries(map, depth) {
+    if (++depth > keys.length) return map;
+    var array, sortKey = sortKeys[depth - 1];
+    if (rollup != null && depth >= keys.length) array = map.entries();
+    else array = [], map.each(function(v, k) { array.push({key: k, values: entries(v, depth)}); });
+    return sortKey != null ? array.sort(function(a, b) { return sortKey(a.key, b.key); }) : array;
+  }
+
+  return nest = {
+    object: function(array) { return apply(array, 0, createObject, setObject); },
+    map: function(array) { return apply(array, 0, createMap, setMap); },
+    entries: function(array) { return entries(apply(array, 0, createMap, setMap), 0); },
+    key: function(d) { keys.push(d); return nest; },
+    sortKeys: function(order) { sortKeys[keys.length - 1] = order; return nest; },
+    sortValues: function(order) { sortValues = order; return nest; },
+    rollup: function(f) { rollup = f; return nest; }
+  };
+};
+
+function createObject() {
+  return {};
+}
+
+function setObject(object, key, value) {
+  object[key] = value;
+}
+
+function createMap() {
+  return map$1();
+}
+
+function setMap(map, key, value) {
+  map.set(key, value);
+}
+
+function Set() {}
+
+var proto = map$1.prototype;
+
+Set.prototype = set$2.prototype = {
+  constructor: Set,
+  has: proto.has,
+  add: function(value) {
+    value += "";
+    this[prefix + value] = value;
+    return this;
+  },
+  remove: proto.remove,
+  clear: proto.clear,
+  values: proto.keys,
+  size: proto.size,
+  empty: proto.empty,
+  each: proto.each
+};
+
+function set$2(object, f) {
+  var set = new Set;
+
+  // Copy constructor.
+  if (object instanceof Set) object.each(function(value) { set.add(value); });
+
+  // Otherwise, assume it’s an array.
+  else if (object) {
+    var i = -1, n = object.length;
+    if (f == null) while (++i < n) set.add(object[i]);
+    else while (++i < n) set.add(f(object[i], i, object));
+  }
+
+  return set;
+}
+
+var keys = function(map) {
+  var keys = [];
+  for (var key in map) keys.push(key);
+  return keys;
+};
+
+var values = function(map) {
+  var values = [];
+  for (var key in map) values.push(map[key]);
+  return values;
+};
+
+var entries = function(map) {
+  var entries = [];
+  for (var key in map) entries.push({key: key, value: map[key]});
+  return entries;
+};
+
+function objectConverter(columns) {
+  return new Function("d", "return {" + columns.map(function(name, i) {
+    return JSON.stringify(name) + ": d[" + i + "]";
+  }).join(",") + "}");
+}
+
+function customConverter(columns, f) {
+  var object = objectConverter(columns);
+  return function(row, i) {
+    return f(object(row), i, columns);
+  };
+}
+
+// Compute unique columns in order of discovery.
+function inferColumns(rows) {
+  var columnSet = Object.create(null),
+      columns = [];
+
+  rows.forEach(function(row) {
+    for (var column in row) {
+      if (!(column in columnSet)) {
+        columns.push(columnSet[column] = column);
+      }
+    }
+  });
+
+  return columns;
+}
+
+var dsv = function(delimiter) {
+  var reFormat = new RegExp("[\"" + delimiter + "\n\r]"),
+      delimiterCode = delimiter.charCodeAt(0);
+
+  function parse(text, f) {
+    var convert, columns, rows = parseRows(text, function(row, i) {
+      if (convert) return convert(row, i - 1);
+      columns = row, convert = f ? customConverter(row, f) : objectConverter(row);
+    });
+    rows.columns = columns;
+    return rows;
+  }
+
+  function parseRows(text, f) {
+    var EOL = {}, // sentinel value for end-of-line
+        EOF = {}, // sentinel value for end-of-file
+        rows = [], // output rows
+        N = text.length,
+        I = 0, // current character index
+        n = 0, // the current line number
+        t, // the current token
+        eol; // is the current token followed by EOL?
+
+    function token() {
+      if (I >= N) return EOF; // special case: end of file
+      if (eol) return eol = false, EOL; // special case: end of line
+
+      // special case: quotes
+      var j = I, c;
+      if (text.charCodeAt(j) === 34) {
+        var i = j;
+        while (i++ < N) {
+          if (text.charCodeAt(i) === 34) {
+            if (text.charCodeAt(i + 1) !== 34) break;
+            ++i;
           }
         }
-        d3.selectAll(targets).on(zoomName, null);
-        subject.on(mousedown, mousedowned).on(touchstart, touchstarted);
-        dragRestore();
-        zoomended(dispatch);
-      }
-    }
-    function mousewheeled() {
-      var dispatch = event.of(this, arguments);
-      if (mousewheelTimer) clearTimeout(mousewheelTimer); else translate0 = location(center0 = center || d3.mouse(this)), 
-      d3_selection_interrupt.call(this), zoomstarted(dispatch);
-      mousewheelTimer = setTimeout(function() {
-        mousewheelTimer = null;
-        zoomended(dispatch);
-      }, 50);
-      d3_eventPreventDefault();
-      scaleTo(Math.pow(2, d3_behavior_zoomDelta() * .002) * view.k);
-      translateTo(center0, translate0);
-      zoomed(dispatch);
-    }
-    function dblclicked() {
-      var dispatch = event.of(this, arguments), p = d3.mouse(this), l = location(p), k = Math.log(view.k) / Math.LN2;
-      zoomstarted(dispatch);
-      scaleTo(Math.pow(2, d3.event.shiftKey ? Math.ceil(k) - 1 : Math.floor(k) + 1));
-      translateTo(p, l);
-      zoomed(dispatch);
-      zoomended(dispatch);
-    }
-    return d3.rebind(zoom, event, "on");
-  };
-  var d3_behavior_zoomInfinity = [ 0, Infinity ];
-  var d3_behavior_zoomDelta, d3_behavior_zoomWheel = "onwheel" in d3_document ? (d3_behavior_zoomDelta = function() {
-    return -d3.event.deltaY * (d3.event.deltaMode ? 120 : 1);
-  }, "wheel") : "onmousewheel" in d3_document ? (d3_behavior_zoomDelta = function() {
-    return d3.event.wheelDelta;
-  }, "mousewheel") : (d3_behavior_zoomDelta = function() {
-    return -d3.event.detail;
-  }, "MozMousePixelScroll");
-  d3.color = d3_color;
-  function d3_color() {}
-  d3_color.prototype.toString = function() {
-    return this.rgb() + "";
-  };
-  d3.hsl = d3_hsl;
-  function d3_hsl(h, s, l) {
-    return this instanceof d3_hsl ? void (this.h = +h, this.s = +s, this.l = +l) : arguments.length < 2 ? h instanceof d3_hsl ? new d3_hsl(h.h, h.s, h.l) : d3_rgb_parse("" + h, d3_rgb_hsl, d3_hsl) : new d3_hsl(h, s, l);
-  }
-  var d3_hslPrototype = d3_hsl.prototype = new d3_color();
-  d3_hslPrototype.brighter = function(k) {
-    k = Math.pow(.7, arguments.length ? k : 1);
-    return new d3_hsl(this.h, this.s, this.l / k);
-  };
-  d3_hslPrototype.darker = function(k) {
-    k = Math.pow(.7, arguments.length ? k : 1);
-    return new d3_hsl(this.h, this.s, k * this.l);
-  };
-  d3_hslPrototype.rgb = function() {
-    return d3_hsl_rgb(this.h, this.s, this.l);
-  };
-  function d3_hsl_rgb(h, s, l) {
-    var m1, m2;
-    h = isNaN(h) ? 0 : (h %= 360) < 0 ? h + 360 : h;
-    s = isNaN(s) ? 0 : s < 0 ? 0 : s > 1 ? 1 : s;
-    l = l < 0 ? 0 : l > 1 ? 1 : l;
-    m2 = l <= .5 ? l * (1 + s) : l + s - l * s;
-    m1 = 2 * l - m2;
-    function v(h) {
-      if (h > 360) h -= 360; else if (h < 0) h += 360;
-      if (h < 60) return m1 + (m2 - m1) * h / 60;
-      if (h < 180) return m2;
-      if (h < 240) return m1 + (m2 - m1) * (240 - h) / 60;
-      return m1;
-    }
-    function vv(h) {
-      return Math.round(v(h) * 255);
-    }
-    return new d3_rgb(vv(h + 120), vv(h), vv(h - 120));
-  }
-  d3.hcl = d3_hcl;
-  function d3_hcl(h, c, l) {
-    return this instanceof d3_hcl ? void (this.h = +h, this.c = +c, this.l = +l) : arguments.length < 2 ? h instanceof d3_hcl ? new d3_hcl(h.h, h.c, h.l) : h instanceof d3_lab ? d3_lab_hcl(h.l, h.a, h.b) : d3_lab_hcl((h = d3_rgb_lab((h = d3.rgb(h)).r, h.g, h.b)).l, h.a, h.b) : new d3_hcl(h, c, l);
-  }
-  var d3_hclPrototype = d3_hcl.prototype = new d3_color();
-  d3_hclPrototype.brighter = function(k) {
-    return new d3_hcl(this.h, this.c, Math.min(100, this.l + d3_lab_K * (arguments.length ? k : 1)));
-  };
-  d3_hclPrototype.darker = function(k) {
-    return new d3_hcl(this.h, this.c, Math.max(0, this.l - d3_lab_K * (arguments.length ? k : 1)));
-  };
-  d3_hclPrototype.rgb = function() {
-    return d3_hcl_lab(this.h, this.c, this.l).rgb();
-  };
-  function d3_hcl_lab(h, c, l) {
-    if (isNaN(h)) h = 0;
-    if (isNaN(c)) c = 0;
-    return new d3_lab(l, Math.cos(h *= d3_radians) * c, Math.sin(h) * c);
-  }
-  d3.lab = d3_lab;
-  function d3_lab(l, a, b) {
-    return this instanceof d3_lab ? void (this.l = +l, this.a = +a, this.b = +b) : arguments.length < 2 ? l instanceof d3_lab ? new d3_lab(l.l, l.a, l.b) : l instanceof d3_hcl ? d3_hcl_lab(l.l, l.c, l.h) : d3_rgb_lab((l = d3_rgb(l)).r, l.g, l.b) : new d3_lab(l, a, b);
-  }
-  var d3_lab_K = 18;
-  var d3_lab_X = .95047, d3_lab_Y = 1, d3_lab_Z = 1.08883;
-  var d3_labPrototype = d3_lab.prototype = new d3_color();
-  d3_labPrototype.brighter = function(k) {
-    return new d3_lab(Math.min(100, this.l + d3_lab_K * (arguments.length ? k : 1)), this.a, this.b);
-  };
-  d3_labPrototype.darker = function(k) {
-    return new d3_lab(Math.max(0, this.l - d3_lab_K * (arguments.length ? k : 1)), this.a, this.b);
-  };
-  d3_labPrototype.rgb = function() {
-    return d3_lab_rgb(this.l, this.a, this.b);
-  };
-  function d3_lab_rgb(l, a, b) {
-    var y = (l + 16) / 116, x = y + a / 500, z = y - b / 200;
-    x = d3_lab_xyz(x) * d3_lab_X;
-    y = d3_lab_xyz(y) * d3_lab_Y;
-    z = d3_lab_xyz(z) * d3_lab_Z;
-    return new d3_rgb(d3_xyz_rgb(3.2404542 * x - 1.5371385 * y - .4985314 * z), d3_xyz_rgb(-.969266 * x + 1.8760108 * y + .041556 * z), d3_xyz_rgb(.0556434 * x - .2040259 * y + 1.0572252 * z));
-  }
-  function d3_lab_hcl(l, a, b) {
-    return l > 0 ? new d3_hcl(Math.atan2(b, a) * d3_degrees, Math.sqrt(a * a + b * b), l) : new d3_hcl(NaN, NaN, l);
-  }
-  function d3_lab_xyz(x) {
-    return x > .206893034 ? x * x * x : (x - 4 / 29) / 7.787037;
-  }
-  function d3_xyz_lab(x) {
-    return x > .008856 ? Math.pow(x, 1 / 3) : 7.787037 * x + 4 / 29;
-  }
-  function d3_xyz_rgb(r) {
-    return Math.round(255 * (r <= .00304 ? 12.92 * r : 1.055 * Math.pow(r, 1 / 2.4) - .055));
-  }
-  d3.rgb = d3_rgb;
-  function d3_rgb(r, g, b) {
-    return this instanceof d3_rgb ? void (this.r = ~~r, this.g = ~~g, this.b = ~~b) : arguments.length < 2 ? r instanceof d3_rgb ? new d3_rgb(r.r, r.g, r.b) : d3_rgb_parse("" + r, d3_rgb, d3_hsl_rgb) : new d3_rgb(r, g, b);
-  }
-  function d3_rgbNumber(value) {
-    return new d3_rgb(value >> 16, value >> 8 & 255, value & 255);
-  }
-  function d3_rgbString(value) {
-    return d3_rgbNumber(value) + "";
-  }
-  var d3_rgbPrototype = d3_rgb.prototype = new d3_color();
-  d3_rgbPrototype.brighter = function(k) {
-    k = Math.pow(.7, arguments.length ? k : 1);
-    var r = this.r, g = this.g, b = this.b, i = 30;
-    if (!r && !g && !b) return new d3_rgb(i, i, i);
-    if (r && r < i) r = i;
-    if (g && g < i) g = i;
-    if (b && b < i) b = i;
-    return new d3_rgb(Math.min(255, r / k), Math.min(255, g / k), Math.min(255, b / k));
-  };
-  d3_rgbPrototype.darker = function(k) {
-    k = Math.pow(.7, arguments.length ? k : 1);
-    return new d3_rgb(k * this.r, k * this.g, k * this.b);
-  };
-  d3_rgbPrototype.hsl = function() {
-    return d3_rgb_hsl(this.r, this.g, this.b);
-  };
-  d3_rgbPrototype.toString = function() {
-    return "#" + d3_rgb_hex(this.r) + d3_rgb_hex(this.g) + d3_rgb_hex(this.b);
-  };
-  function d3_rgb_hex(v) {
-    return v < 16 ? "0" + Math.max(0, v).toString(16) : Math.min(255, v).toString(16);
-  }
-  function d3_rgb_parse(format, rgb, hsl) {
-    var r = 0, g = 0, b = 0, m1, m2, color;
-    m1 = /([a-z]+)\((.*)\)/i.exec(format);
-    if (m1) {
-      m2 = m1[2].split(",");
-      switch (m1[1]) {
-       case "hsl":
-        {
-          return hsl(parseFloat(m2[0]), parseFloat(m2[1]) / 100, parseFloat(m2[2]) / 100);
-        }
-
-       case "rgb":
-        {
-          return rgb(d3_rgb_parseNumber(m2[0]), d3_rgb_parseNumber(m2[1]), d3_rgb_parseNumber(m2[2]));
-        }
-      }
-    }
-    if (color = d3_rgb_names.get(format)) return rgb(color.r, color.g, color.b);
-    if (format != null && format.charAt(0) === "#" && !isNaN(color = parseInt(format.substring(1), 16))) {
-      if (format.length === 4) {
-        r = (color & 3840) >> 4;
-        r = r >> 4 | r;
-        g = color & 240;
-        g = g >> 4 | g;
-        b = color & 15;
-        b = b << 4 | b;
-      } else if (format.length === 7) {
-        r = (color & 16711680) >> 16;
-        g = (color & 65280) >> 8;
-        b = color & 255;
-      }
-    }
-    return rgb(r, g, b);
-  }
-  function d3_rgb_hsl(r, g, b) {
-    var min = Math.min(r /= 255, g /= 255, b /= 255), max = Math.max(r, g, b), d = max - min, h, s, l = (max + min) / 2;
-    if (d) {
-      s = l < .5 ? d / (max + min) : d / (2 - max - min);
-      if (r == max) h = (g - b) / d + (g < b ? 6 : 0); else if (g == max) h = (b - r) / d + 2; else h = (r - g) / d + 4;
-      h *= 60;
-    } else {
-      h = NaN;
-      s = l > 0 && l < 1 ? 0 : h;
-    }
-    return new d3_hsl(h, s, l);
-  }
-  function d3_rgb_lab(r, g, b) {
-    r = d3_rgb_xyz(r);
-    g = d3_rgb_xyz(g);
-    b = d3_rgb_xyz(b);
-    var x = d3_xyz_lab((.4124564 * r + .3575761 * g + .1804375 * b) / d3_lab_X), y = d3_xyz_lab((.2126729 * r + .7151522 * g + .072175 * b) / d3_lab_Y), z = d3_xyz_lab((.0193339 * r + .119192 * g + .9503041 * b) / d3_lab_Z);
-    return d3_lab(116 * y - 16, 500 * (x - y), 200 * (y - z));
-  }
-  function d3_rgb_xyz(r) {
-    return (r /= 255) <= .04045 ? r / 12.92 : Math.pow((r + .055) / 1.055, 2.4);
-  }
-  function d3_rgb_parseNumber(c) {
-    var f = parseFloat(c);
-    return c.charAt(c.length - 1) === "%" ? Math.round(f * 2.55) : f;
-  }
-  var d3_rgb_names = d3.map({
-    aliceblue: 15792383,
-    antiquewhite: 16444375,
-    aqua: 65535,
-    aquamarine: 8388564,
-    azure: 15794175,
-    beige: 16119260,
-    bisque: 16770244,
-    black: 0,
-    blanchedalmond: 16772045,
-    blue: 255,
-    blueviolet: 9055202,
-    brown: 10824234,
-    burlywood: 14596231,
-    cadetblue: 6266528,
-    chartreuse: 8388352,
-    chocolate: 13789470,
-    coral: 16744272,
-    cornflowerblue: 6591981,
-    cornsilk: 16775388,
-    crimson: 14423100,
-    cyan: 65535,
-    darkblue: 139,
-    darkcyan: 35723,
-    darkgoldenrod: 12092939,
-    darkgray: 11119017,
-    darkgreen: 25600,
-    darkgrey: 11119017,
-    darkkhaki: 12433259,
-    darkmagenta: 9109643,
-    darkolivegreen: 5597999,
-    darkorange: 16747520,
-    darkorchid: 10040012,
-    darkred: 9109504,
-    darksalmon: 15308410,
-    darkseagreen: 9419919,
-    darkslateblue: 4734347,
-    darkslategray: 3100495,
-    darkslategrey: 3100495,
-    darkturquoise: 52945,
-    darkviolet: 9699539,
-    deeppink: 16716947,
-    deepskyblue: 49151,
-    dimgray: 6908265,
-    dimgrey: 6908265,
-    dodgerblue: 2003199,
-    firebrick: 11674146,
-    floralwhite: 16775920,
-    forestgreen: 2263842,
-    fuchsia: 16711935,
-    gainsboro: 14474460,
-    ghostwhite: 16316671,
-    gold: 16766720,
-    goldenrod: 14329120,
-    gray: 8421504,
-    green: 32768,
-    greenyellow: 11403055,
-    grey: 8421504,
-    honeydew: 15794160,
-    hotpink: 16738740,
-    indianred: 13458524,
-    indigo: 4915330,
-    ivory: 16777200,
-    khaki: 15787660,
-    lavender: 15132410,
-    lavenderblush: 16773365,
-    lawngreen: 8190976,
-    lemonchiffon: 16775885,
-    lightblue: 11393254,
-    lightcoral: 15761536,
-    lightcyan: 14745599,
-    lightgoldenrodyellow: 16448210,
-    lightgray: 13882323,
-    lightgreen: 9498256,
-    lightgrey: 13882323,
-    lightpink: 16758465,
-    lightsalmon: 16752762,
-    lightseagreen: 2142890,
-    lightskyblue: 8900346,
-    lightslategray: 7833753,
-    lightslategrey: 7833753,
-    lightsteelblue: 11584734,
-    lightyellow: 16777184,
-    lime: 65280,
-    limegreen: 3329330,
-    linen: 16445670,
-    magenta: 16711935,
-    maroon: 8388608,
-    mediumaquamarine: 6737322,
-    mediumblue: 205,
-    mediumorchid: 12211667,
-    mediumpurple: 9662683,
-    mediumseagreen: 3978097,
-    mediumslateblue: 8087790,
-    mediumspringgreen: 64154,
-    mediumturquoise: 4772300,
-    mediumvioletred: 13047173,
-    midnightblue: 1644912,
-    mintcream: 16121850,
-    mistyrose: 16770273,
-    moccasin: 16770229,
-    navajowhite: 16768685,
-    navy: 128,
-    oldlace: 16643558,
-    olive: 8421376,
-    olivedrab: 7048739,
-    orange: 16753920,
-    orangered: 16729344,
-    orchid: 14315734,
-    palegoldenrod: 15657130,
-    palegreen: 10025880,
-    paleturquoise: 11529966,
-    palevioletred: 14381203,
-    papayawhip: 16773077,
-    peachpuff: 16767673,
-    peru: 13468991,
-    pink: 16761035,
-    plum: 14524637,
-    powderblue: 11591910,
-    purple: 8388736,
-    red: 16711680,
-    rosybrown: 12357519,
-    royalblue: 4286945,
-    saddlebrown: 9127187,
-    salmon: 16416882,
-    sandybrown: 16032864,
-    seagreen: 3050327,
-    seashell: 16774638,
-    sienna: 10506797,
-    silver: 12632256,
-    skyblue: 8900331,
-    slateblue: 6970061,
-    slategray: 7372944,
-    slategrey: 7372944,
-    snow: 16775930,
-    springgreen: 65407,
-    steelblue: 4620980,
-    tan: 13808780,
-    teal: 32896,
-    thistle: 14204888,
-    tomato: 16737095,
-    turquoise: 4251856,
-    violet: 15631086,
-    wheat: 16113331,
-    white: 16777215,
-    whitesmoke: 16119285,
-    yellow: 16776960,
-    yellowgreen: 10145074
+        I = i + 2;
+        c = text.charCodeAt(i + 1);
+        if (c === 13) {
+          eol = true;
+          if (text.charCodeAt(i + 2) === 10) ++I;
+        } else if (c === 10) {
+          eol = true;
+        }
+        return text.slice(j + 1, i).replace(/""/g, "\"");
+      }
+
+      // common case: find next delimiter or newline
+      while (I < N) {
+        var k = 1;
+        c = text.charCodeAt(I++);
+        if (c === 10) eol = true; // \n
+        else if (c === 13) { eol = true; if (text.charCodeAt(I) === 10) ++I, ++k; } // \r|\r\n
+        else if (c !== delimiterCode) continue;
+        return text.slice(j, I - k);
+      }
+
+      // special case: last token before EOF
+      return text.slice(j);
+    }
+
+    while ((t = token()) !== EOF) {
+      var a = [];
+      while (t !== EOL && t !== EOF) {
+        a.push(t);
+        t = token();
+      }
+      if (f && (a = f(a, n++)) == null) continue;
+      rows.push(a);
+    }
+
+    return rows;
+  }
+
+  function format(rows, columns) {
+    if (columns == null) columns = inferColumns(rows);
+    return [columns.map(formatValue).join(delimiter)].concat(rows.map(function(row) {
+      return columns.map(function(column) {
+        return formatValue(row[column]);
+      }).join(delimiter);
+    })).join("\n");
+  }
+
+  function formatRows(rows) {
+    return rows.map(formatRow).join("\n");
+  }
+
+  function formatRow(row) {
+    return row.map(formatValue).join(delimiter);
+  }
+
+  function formatValue(text) {
+    return text == null ? ""
+        : reFormat.test(text += "") ? "\"" + text.replace(/\"/g, "\"\"") + "\""
+        : text;
+  }
+
+  return {
+    parse: parse,
+    parseRows: parseRows,
+    format: format,
+    formatRows: formatRows
+  };
+};
+
+var csv = dsv(",");
+
+var csvParse = csv.parse;
+var csvParseRows = csv.parseRows;
+var csvFormat = csv.format;
+var csvFormatRows = csv.formatRows;
+
+var tsv = dsv("\t");
+
+var tsvParse = tsv.parse;
+var tsvParseRows = tsv.parseRows;
+var tsvFormat = tsv.format;
+var tsvFormatRows = tsv.formatRows;
+
+var center$1 = function(x, y) {
+  var nodes;
+
+  if (x == null) x = 0;
+  if (y == null) y = 0;
+
+  function force() {
+    var i,
+        n = nodes.length,
+        node,
+        sx = 0,
+        sy = 0;
+
+    for (i = 0; i < n; ++i) {
+      node = nodes[i], sx += node.x, sy += node.y;
+    }
+
+    for (sx = sx / n - x, sy = sy / n - y, i = 0; i < n; ++i) {
+      node = nodes[i], node.x -= sx, node.y -= sy;
+    }
+  }
+
+  force.initialize = function(_) {
+    nodes = _;
+  };
+
+  force.x = function(_) {
+    return arguments.length ? (x = +_, force) : x;
+  };
+
+  force.y = function(_) {
+    return arguments.length ? (y = +_, force) : y;
+  };
+
+  return force;
+};
+
+var constant$6 = function(x) {
+  return function() {
+    return x;
+  };
+};
+
+var jiggle = function() {
+  return (Math.random() - 0.5) * 1e-6;
+};
+
+var tree_add = function(d) {
+  var x = +this._x.call(null, d),
+      y = +this._y.call(null, d);
+  return add(this.cover(x, y), x, y, d);
+};
+
+function add(tree, x, y, d) {
+  if (isNaN(x) || isNaN(y)) return tree; // ignore invalid points
+
+  var parent,
+      node = tree._root,
+      leaf = {data: d},
+      x0 = tree._x0,
+      y0 = tree._y0,
+      x1 = tree._x1,
+      y1 = tree._y1,
+      xm,
+      ym,
+      xp,
+      yp,
+      right,
+      bottom,
+      i,
+      j;
+
+  // If the tree is empty, initialize the root as a leaf.
+  if (!node) return tree._root = leaf, tree;
+
+  // Find the existing leaf for the new point, or add it.
+  while (node.length) {
+    if (right = x >= (xm = (x0 + x1) / 2)) x0 = xm; else x1 = xm;
+    if (bottom = y >= (ym = (y0 + y1) / 2)) y0 = ym; else y1 = ym;
+    if (parent = node, !(node = node[i = bottom << 1 | right])) return parent[i] = leaf, tree;
+  }
+
+  // Is the new point is exactly coincident with the existing point?
+  xp = +tree._x.call(null, node.data);
+  yp = +tree._y.call(null, node.data);
+  if (x === xp && y === yp) return leaf.next = node, parent ? parent[i] = leaf : tree._root = leaf, tree;
+
+  // Otherwise, split the leaf node until the old and new point are separated.
+  do {
+    parent = parent ? parent[i] = new Array(4) : tree._root = new Array(4);
+    if (right = x >= (xm = (x0 + x1) / 2)) x0 = xm; else x1 = xm;
+    if (bottom = y >= (ym = (y0 + y1) / 2)) y0 = ym; else y1 = ym;
+  } while ((i = bottom << 1 | right) === (j = (yp >= ym) << 1 | (xp >= xm)));
+  return parent[j] = node, parent[i] = leaf, tree;
+}
+
+function addAll(data) {
+  var d, i, n = data.length,
+      x,
+      y,
+      xz = new Array(n),
+      yz = new Array(n),
+      x0 = Infinity,
+      y0 = Infinity,
+      x1 = -Infinity,
+      y1 = -Infinity;
+
+  // Compute the points and their extent.
+  for (i = 0; i < n; ++i) {
+    if (isNaN(x = +this._x.call(null, d = data[i])) || isNaN(y = +this._y.call(null, d))) continue;
+    xz[i] = x;
+    yz[i] = y;
+    if (x < x0) x0 = x;
+    if (x > x1) x1 = x;
+    if (y < y0) y0 = y;
+    if (y > y1) y1 = y;
+  }
+
+  // If there were no (valid) points, inherit the existing extent.
+  if (x1 < x0) x0 = this._x0, x1 = this._x1;
+  if (y1 < y0) y0 = this._y0, y1 = this._y1;
+
+  // Expand the tree to cover the new points.
+  this.cover(x0, y0).cover(x1, y1);
+
+  // Add the new points.
+  for (i = 0; i < n; ++i) {
+    add(this, xz[i], yz[i], data[i]);
+  }
+
+  return this;
+}
+
+var tree_cover = function(x, y) {
+  if (isNaN(x = +x) || isNaN(y = +y)) return this; // ignore invalid points
+
+  var x0 = this._x0,
+      y0 = this._y0,
+      x1 = this._x1,
+      y1 = this._y1;
+
+  // If the quadtree has no extent, initialize them.
+  // Integer extent are necessary so that if we later double the extent,
+  // the existing quadrant boundaries don’t change due to floating point error!
+  if (isNaN(x0)) {
+    x1 = (x0 = Math.floor(x)) + 1;
+    y1 = (y0 = Math.floor(y)) + 1;
+  }
+
+  // Otherwise, double repeatedly to cover.
+  else if (x0 > x || x > x1 || y0 > y || y > y1) {
+    var z = x1 - x0,
+        node = this._root,
+        parent,
+        i;
+
+    switch (i = (y < (y0 + y1) / 2) << 1 | (x < (x0 + x1) / 2)) {
+      case 0: {
+        do parent = new Array(4), parent[i] = node, node = parent;
+        while (z *= 2, x1 = x0 + z, y1 = y0 + z, x > x1 || y > y1);
+        break;
+      }
+      case 1: {
+        do parent = new Array(4), parent[i] = node, node = parent;
+        while (z *= 2, x0 = x1 - z, y1 = y0 + z, x0 > x || y > y1);
+        break;
+      }
+      case 2: {
+        do parent = new Array(4), parent[i] = node, node = parent;
+        while (z *= 2, x1 = x0 + z, y0 = y1 - z, x > x1 || y0 > y);
+        break;
+      }
+      case 3: {
+        do parent = new Array(4), parent[i] = node, node = parent;
+        while (z *= 2, x0 = x1 - z, y0 = y1 - z, x0 > x || y0 > y);
+        break;
+      }
+    }
+
+    if (this._root && this._root.length) this._root = node;
+  }
+
+  // If the quadtree covers the point already, just return.
+  else return this;
+
+  this._x0 = x0;
+  this._y0 = y0;
+  this._x1 = x1;
+  this._y1 = y1;
+  return this;
+};
+
+var tree_data = function() {
+  var data = [];
+  this.visit(function(node) {
+    if (!node.length) do data.push(node.data); while (node = node.next)
+  });
+  return data;
+};
+
+var tree_extent = function(_) {
+  return arguments.length
+      ? this.cover(+_[0][0], +_[0][1]).cover(+_[1][0], +_[1][1])
+      : isNaN(this._x0) ? undefined : [[this._x0, this._y0], [this._x1, this._y1]];
+};
+
+var Quad = function(node, x0, y0, x1, y1) {
+  this.node = node;
+  this.x0 = x0;
+  this.y0 = y0;
+  this.x1 = x1;
+  this.y1 = y1;
+};
+
+var tree_find = function(x, y, radius) {
+  var data,
+      x0 = this._x0,
+      y0 = this._y0,
+      x1,
+      y1,
+      x2,
+      y2,
+      x3 = this._x1,
+      y3 = this._y1,
+      quads = [],
+      node = this._root,
+      q,
+      i;
+
+  if (node) quads.push(new Quad(node, x0, y0, x3, y3));
+  if (radius == null) radius = Infinity;
+  else {
+    x0 = x - radius, y0 = y - radius;
+    x3 = x + radius, y3 = y + radius;
+    radius *= radius;
+  }
+
+  while (q = quads.pop()) {
+
+    // Stop searching if this quadrant can’t contain a closer node.
+    if (!(node = q.node)
+        || (x1 = q.x0) > x3
+        || (y1 = q.y0) > y3
+        || (x2 = q.x1) < x0
+        || (y2 = q.y1) < y0) continue;
+
+    // Bisect the current quadrant.
+    if (node.length) {
+      var xm = (x1 + x2) / 2,
+          ym = (y1 + y2) / 2;
+
+      quads.push(
+        new Quad(node[3], xm, ym, x2, y2),
+        new Quad(node[2], x1, ym, xm, y2),
+        new Quad(node[1], xm, y1, x2, ym),
+        new Quad(node[0], x1, y1, xm, ym)
+      );
+
+      // Visit the closest quadrant first.
+      if (i = (y >= ym) << 1 | (x >= xm)) {
+        q = quads[quads.length - 1];
+        quads[quads.length - 1] = quads[quads.length - 1 - i];
+        quads[quads.length - 1 - i] = q;
+      }
+    }
+
+    // Visit this point. (Visiting coincident points isn’t necessary!)
+    else {
+      var dx = x - +this._x.call(null, node.data),
+          dy = y - +this._y.call(null, node.data),
+          d2 = dx * dx + dy * dy;
+      if (d2 < radius) {
+        var d = Math.sqrt(radius = d2);
+        x0 = x - d, y0 = y - d;
+        x3 = x + d, y3 = y + d;
+        data = node.data;
+      }
+    }
+  }
+
+  return data;
+};
+
+var tree_remove = function(d) {
+  if (isNaN(x = +this._x.call(null, d)) || isNaN(y = +this._y.call(null, d))) return this; // ignore invalid points
+
+  var parent,
+      node = this._root,
+      retainer,
+      previous,
+      next,
+      x0 = this._x0,
+      y0 = this._y0,
+      x1 = this._x1,
+      y1 = this._y1,
+      x,
+      y,
+      xm,
+      ym,
+      right,
+      bottom,
+      i,
+      j;
+
+  // If the tree is empty, initialize the root as a leaf.
+  if (!node) return this;
+
+  // Find the leaf node for the point.
+  // While descending, also retain the deepest parent with a non-removed sibling.
+  if (node.length) while (true) {
+    if (right = x >= (xm = (x0 + x1) / 2)) x0 = xm; else x1 = xm;
+    if (bottom = y >= (ym = (y0 + y1) / 2)) y0 = ym; else y1 = ym;
+    if (!(parent = node, node = node[i = bottom << 1 | right])) return this;
+    if (!node.length) break;
+    if (parent[(i + 1) & 3] || parent[(i + 2) & 3] || parent[(i + 3) & 3]) retainer = parent, j = i;
+  }
+
+  // Find the point to remove.
+  while (node.data !== d) if (!(previous = node, node = node.next)) return this;
+  if (next = node.next) delete node.next;
+
+  // If there are multiple coincident points, remove just the point.
+  if (previous) return (next ? previous.next = next : delete previous.next), this;
+
+  // If this is the root point, remove it.
+  if (!parent) return this._root = next, this;
+
+  // Remove this leaf.
+  next ? parent[i] = next : delete parent[i];
+
+  // If the parent now contains exactly one leaf, collapse superfluous parents.
+  if ((node = parent[0] || parent[1] || parent[2] || parent[3])
+      && node === (parent[3] || parent[2] || parent[1] || parent[0])
+      && !node.length) {
+    if (retainer) retainer[j] = node;
+    else this._root = node;
+  }
+
+  return this;
+};
+
+function removeAll(data) {
+  for (var i = 0, n = data.length; i < n; ++i) this.remove(data[i]);
+  return this;
+}
+
+var tree_root = function() {
+  return this._root;
+};
+
+var tree_size = function() {
+  var size = 0;
+  this.visit(function(node) {
+    if (!node.length) do ++size; while (node = node.next)
   });
-  d3_rgb_names.forEach(function(key, value) {
-    d3_rgb_names.set(key, d3_rgbNumber(value));
-  });
-  function d3_functor(v) {
-    return typeof v === "function" ? v : function() {
-      return v;
-    };
-  }
-  d3.functor = d3_functor;
-  function d3_identity(d) {
-    return d;
-  }
-  d3.xhr = d3_xhrType(d3_identity);
-  function d3_xhrType(response) {
-    return function(url, mimeType, callback) {
-      if (arguments.length === 2 && typeof mimeType === "function") callback = mimeType, 
-      mimeType = null;
-      return d3_xhr(url, mimeType, response, callback);
-    };
-  }
-  function d3_xhr(url, mimeType, response, callback) {
-    var xhr = {}, dispatch = d3.dispatch("beforesend", "progress", "load", "error"), headers = {}, request = new XMLHttpRequest(), responseType = null;
-    if (d3_window.XDomainRequest && !("withCredentials" in request) && /^(http(s)?:)?\/\//.test(url)) request = new XDomainRequest();
-    "onload" in request ? request.onload = request.onerror = respond : request.onreadystatechange = function() {
-      request.readyState > 3 && respond();
-    };
-    function respond() {
-      var status = request.status, result;
-      if (!status && request.responseText || status >= 200 && status < 300 || status === 304) {
-        try {
-          result = response.call(xhr, request);
-        } catch (e) {
-          dispatch.error.call(xhr, e);
-          return;
-        }
-        dispatch.load.call(xhr, result);
+  return size;
+};
+
+var tree_visit = function(callback) {
+  var quads = [], q, node = this._root, child, x0, y0, x1, y1;
+  if (node) quads.push(new Quad(node, this._x0, this._y0, this._x1, this._y1));
+  while (q = quads.pop()) {
+    if (!callback(node = q.node, x0 = q.x0, y0 = q.y0, x1 = q.x1, y1 = q.y1) && node.length) {
+      var xm = (x0 + x1) / 2, ym = (y0 + y1) / 2;
+      if (child = node[3]) quads.push(new Quad(child, xm, ym, x1, y1));
+      if (child = node[2]) quads.push(new Quad(child, x0, ym, xm, y1));
+      if (child = node[1]) quads.push(new Quad(child, xm, y0, x1, ym));
+      if (child = node[0]) quads.push(new Quad(child, x0, y0, xm, ym));
+    }
+  }
+  return this;
+};
+
+var tree_visitAfter = function(callback) {
+  var quads = [], next = [], q;
+  if (this._root) quads.push(new Quad(this._root, this._x0, this._y0, this._x1, this._y1));
+  while (q = quads.pop()) {
+    var node = q.node;
+    if (node.length) {
+      var child, x0 = q.x0, y0 = q.y0, x1 = q.x1, y1 = q.y1, xm = (x0 + x1) / 2, ym = (y0 + y1) / 2;
+      if (child = node[0]) quads.push(new Quad(child, x0, y0, xm, ym));
+      if (child = node[1]) quads.push(new Quad(child, xm, y0, x1, ym));
+      if (child = node[2]) quads.push(new Quad(child, x0, ym, xm, y1));
+      if (child = node[3]) quads.push(new Quad(child, xm, ym, x1, y1));
+    }
+    next.push(q);
+  }
+  while (q = next.pop()) {
+    callback(q.node, q.x0, q.y0, q.x1, q.y1);
+  }
+  return this;
+};
+
+function defaultX(d) {
+  return d[0];
+}
+
+var tree_x = function(_) {
+  return arguments.length ? (this._x = _, this) : this._x;
+};
+
+function defaultY(d) {
+  return d[1];
+}
+
+var tree_y = function(_) {
+  return arguments.length ? (this._y = _, this) : this._y;
+};
+
+function quadtree(nodes, x, y) {
+  var tree = new Quadtree(x == null ? defaultX : x, y == null ? defaultY : y, NaN, NaN, NaN, NaN);
+  return nodes == null ? tree : tree.addAll(nodes);
+}
+
+function Quadtree(x, y, x0, y0, x1, y1) {
+  this._x = x;
+  this._y = y;
+  this._x0 = x0;
+  this._y0 = y0;
+  this._x1 = x1;
+  this._y1 = y1;
+  this._root = undefined;
+}
+
+function leaf_copy(leaf) {
+  var copy = {data: leaf.data}, next = copy;
+  while (leaf = leaf.next) next = next.next = {data: leaf.data};
+  return copy;
+}
+
+var treeProto = quadtree.prototype = Quadtree.prototype;
+
+treeProto.copy = function() {
+  var copy = new Quadtree(this._x, this._y, this._x0, this._y0, this._x1, this._y1),
+      node = this._root,
+      nodes,
+      child;
+
+  if (!node) return copy;
+
+  if (!node.length) return copy._root = leaf_copy(node), copy;
+
+  nodes = [{source: node, target: copy._root = new Array(4)}];
+  while (node = nodes.pop()) {
+    for (var i = 0; i < 4; ++i) {
+      if (child = node.source[i]) {
+        if (child.length) nodes.push({source: child, target: node.target[i] = new Array(4)});
+        else node.target[i] = leaf_copy(child);
+      }
+    }
+  }
+
+  return copy;
+};
+
+treeProto.add = tree_add;
+treeProto.addAll = addAll;
+treeProto.cover = tree_cover;
+treeProto.data = tree_data;
+treeProto.extent = tree_extent;
+treeProto.find = tree_find;
+treeProto.remove = tree_remove;
+treeProto.removeAll = removeAll;
+treeProto.root = tree_root;
+treeProto.size = tree_size;
+treeProto.visit = tree_visit;
+treeProto.visitAfter = tree_visitAfter;
+treeProto.x = tree_x;
+treeProto.y = tree_y;
+
+function x(d) {
+  return d.x + d.vx;
+}
+
+function y(d) {
+  return d.y + d.vy;
+}
+
+var collide = function(radius) {
+  var nodes,
+      radii,
+      strength = 1,
+      iterations = 1;
+
+  if (typeof radius !== "function") radius = constant$6(radius == null ? 1 : +radius);
+
+  function force() {
+    var i, n = nodes.length,
+        tree,
+        node,
+        xi,
+        yi,
+        ri,
+        ri2;
+
+    for (var k = 0; k < iterations; ++k) {
+      tree = quadtree(nodes, x, y).visitAfter(prepare);
+      for (i = 0; i < n; ++i) {
+        node = nodes[i];
+        ri = radii[node.index], ri2 = ri * ri;
+        xi = node.x + node.vx;
+        yi = node.y + node.vy;
+        tree.visit(apply);
+      }
+    }
+
+    function apply(quad, x0, y0, x1, y1) {
+      var data = quad.data, rj = quad.r, r = ri + rj;
+      if (data) {
+        if (data.index > node.index) {
+          var x = xi - data.x - data.vx,
+              y = yi - data.y - data.vy,
+              l = x * x + y * y;
+          if (l < r * r) {
+            if (x === 0) x = jiggle(), l += x * x;
+            if (y === 0) y = jiggle(), l += y * y;
+            l = (r - (l = Math.sqrt(l))) / l * strength;
+            node.vx += (x *= l) * (r = (rj *= rj) / (ri2 + rj));
+            node.vy += (y *= l) * r;
+            data.vx -= x * (r = 1 - r);
+            data.vy -= y * r;
+          }
+        }
+        return;
+      }
+      return x0 > xi + r || x1 < xi - r || y0 > yi + r || y1 < yi - r;
+    }
+  }
+
+  function prepare(quad) {
+    if (quad.data) return quad.r = radii[quad.data.index];
+    for (var i = quad.r = 0; i < 4; ++i) {
+      if (quad[i] && quad[i].r > quad.r) {
+        quad.r = quad[i].r;
+      }
+    }
+  }
+
+  function initialize() {
+    if (!nodes) return;
+    var i, n = nodes.length, node;
+    radii = new Array(n);
+    for (i = 0; i < n; ++i) node = nodes[i], radii[node.index] = +radius(node, i, nodes);
+  }
+
+  force.initialize = function(_) {
+    nodes = _;
+    initialize();
+  };
+
+  force.iterations = function(_) {
+    return arguments.length ? (iterations = +_, force) : iterations;
+  };
+
+  force.strength = function(_) {
+    return arguments.length ? (strength = +_, force) : strength;
+  };
+
+  force.radius = function(_) {
+    return arguments.length ? (radius = typeof _ === "function" ? _ : constant$6(+_), initialize(), force) : radius;
+  };
+
+  return force;
+};
+
+function index(d) {
+  return d.index;
+}
+
+function find(nodeById, nodeId) {
+  var node = nodeById.get(nodeId);
+  if (!node) throw new Error("missing: " + nodeId);
+  return node;
+}
+
+var link = function(links) {
+  var id = index,
+      strength = defaultStrength,
+      strengths,
+      distance = constant$6(30),
+      distances,
+      nodes,
+      count,
+      bias,
+      iterations = 1;
+
+  if (links == null) links = [];
+
+  function defaultStrength(link) {
+    return 1 / Math.min(count[link.source.index], count[link.target.index]);
+  }
+
+  function force(alpha) {
+    for (var k = 0, n = links.length; k < iterations; ++k) {
+      for (var i = 0, link, source, target, x, y, l, b; i < n; ++i) {
+        link = links[i], source = link.source, target = link.target;
+        x = target.x + target.vx - source.x - source.vx || jiggle();
+        y = target.y + target.vy - source.y - source.vy || jiggle();
+        l = Math.sqrt(x * x + y * y);
+        l = (l - distances[i]) / l * alpha * strengths[i];
+        x *= l, y *= l;
+        target.vx -= x * (b = bias[i]);
+        target.vy -= y * b;
+        source.vx += x * (b = 1 - b);
+        source.vy += y * b;
+      }
+    }
+  }
+
+  function initialize() {
+    if (!nodes) return;
+
+    var i,
+        n = nodes.length,
+        m = links.length,
+        nodeById = map$1(nodes, id),
+        link;
+
+    for (i = 0, count = new Array(n); i < m; ++i) {
+      link = links[i], link.index = i;
+      if (typeof link.source !== "object") link.source = find(nodeById, link.source);
+      if (typeof link.target !== "object") link.target = find(nodeById, link.target);
+      count[link.source.index] = (count[link.source.index] || 0) + 1;
+      count[link.target.index] = (count[link.target.index] || 0) + 1;
+    }
+
+    for (i = 0, bias = new Array(m); i < m; ++i) {
+      link = links[i], bias[i] = count[link.source.index] / (count[link.source.index] + count[link.target.index]);
+    }
+
+    strengths = new Array(m), initializeStrength();
+    distances = new Array(m), initializeDistance();
+  }
+
+  function initializeStrength() {
+    if (!nodes) return;
+
+    for (var i = 0, n = links.length; i < n; ++i) {
+      strengths[i] = +strength(links[i], i, links);
+    }
+  }
+
+  function initializeDistance() {
+    if (!nodes) return;
+
+    for (var i = 0, n = links.length; i < n; ++i) {
+      distances[i] = +distance(links[i], i, links);
+    }
+  }
+
+  force.initialize = function(_) {
+    nodes = _;
+    initialize();
+  };
+
+  force.links = function(_) {
+    return arguments.length ? (links = _, initialize(), force) : links;
+  };
+
+  force.id = function(_) {
+    return arguments.length ? (id = _, force) : id;
+  };
+
+  force.iterations = function(_) {
+    return arguments.length ? (iterations = +_, force) : iterations;
+  };
+
+  force.strength = function(_) {
+    return arguments.length ? (strength = typeof _ === "function" ? _ : constant$6(+_), initializeStrength(), force) : strength;
+  };
+
+  force.distance = function(_) {
+    return arguments.length ? (distance = typeof _ === "function" ? _ : constant$6(+_), initializeDistance(), force) : distance;
+  };
+
+  return force;
+};
+
+function x$1(d) {
+  return d.x;
+}
+
+function y$1(d) {
+  return d.y;
+}
+
+var initialRadius = 10;
+var initialAngle = Math.PI * (3 - Math.sqrt(5));
+
+var simulation = function(nodes) {
+  var simulation,
+      alpha = 1,
+      alphaMin = 0.001,
+      alphaDecay = 1 - Math.pow(alphaMin, 1 / 300),
+      alphaTarget = 0,
+      velocityDecay = 0.6,
+      forces = map$1(),
+      stepper = timer(step),
+      event = dispatch("tick", "end");
+
+  if (nodes == null) nodes = [];
+
+  function step() {
+    tick();
+    event.call("tick", simulation);
+    if (alpha < alphaMin) {
+      stepper.stop();
+      event.call("end", simulation);
+    }
+  }
+
+  function tick() {
+    var i, n = nodes.length, node;
+
+    alpha += (alphaTarget - alpha) * alphaDecay;
+
+    forces.each(function(force) {
+      force(alpha);
+    });
+
+    for (i = 0; i < n; ++i) {
+      node = nodes[i];
+      if (node.fx == null) node.x += node.vx *= velocityDecay;
+      else node.x = node.fx, node.vx = 0;
+      if (node.fy == null) node.y += node.vy *= velocityDecay;
+      else node.y = node.fy, node.vy = 0;
+    }
+  }
+
+  function initializeNodes() {
+    for (var i = 0, n = nodes.length, node; i < n; ++i) {
+      node = nodes[i], node.index = i;
+      if (isNaN(node.x) || isNaN(node.y)) {
+        var radius = initialRadius * Math.sqrt(i), angle = i * initialAngle;
+        node.x = radius * Math.cos(angle);
+        node.y = radius * Math.sin(angle);
+      }
+      if (isNaN(node.vx) || isNaN(node.vy)) {
+        node.vx = node.vy = 0;
+      }
+    }
+  }
+
+  function initializeForce(force) {
+    if (force.initialize) force.initialize(nodes);
+    return force;
+  }
+
+  initializeNodes();
+
+  return simulation = {
+    tick: tick,
+
+    restart: function() {
+      return stepper.restart(step), simulation;
+    },
+
+    stop: function() {
+      return stepper.stop(), simulation;
+    },
+
+    nodes: function(_) {
+      return arguments.length ? (nodes = _, initializeNodes(), forces.each(initializeForce), simulation) : nodes;
+    },
+
+    alpha: function(_) {
+      return arguments.length ? (alpha = +_, simulation) : alpha;
+    },
+
+    alphaMin: function(_) {
+      return arguments.length ? (alphaMin = +_, simulation) : alphaMin;
+    },
+
+    alphaDecay: function(_) {
+      return arguments.length ? (alphaDecay = +_, simulation) : +alphaDecay;
+    },
+
+    alphaTarget: function(_) {
+      return arguments.length ? (alphaTarget = +_, simulation) : alphaTarget;
+    },
+
+    velocityDecay: function(_) {
+      return arguments.length ? (velocityDecay = 1 - _, simulation) : 1 - velocityDecay;
+    },
+
+    force: function(name, _) {
+      return arguments.length > 1 ? ((_ == null ? forces.remove(name) : forces.set(name, initializeForce(_))), simulation) : forces.get(name);
+    },
+
+    find: function(x, y, radius) {
+      var i = 0,
+          n = nodes.length,
+          dx,
+          dy,
+          d2,
+          node,
+          closest;
+
+      if (radius == null) radius = Infinity;
+      else radius *= radius;
+
+      for (i = 0; i < n; ++i) {
+        node = nodes[i];
+        dx = x - node.x;
+        dy = y - node.y;
+        d2 = dx * dx + dy * dy;
+        if (d2 < radius) closest = node, radius = d2;
+      }
+
+      return closest;
+    },
+
+    on: function(name, _) {
+      return arguments.length > 1 ? (event.on(name, _), simulation) : event.on(name);
+    }
+  };
+};
+
+var manyBody = function() {
+  var nodes,
+      node,
+      alpha,
+      strength = constant$6(-30),
+      strengths,
+      distanceMin2 = 1,
+      distanceMax2 = Infinity,
+      theta2 = 0.81;
+
+  function force(_) {
+    var i, n = nodes.length, tree = quadtree(nodes, x$1, y$1).visitAfter(accumulate);
+    for (alpha = _, i = 0; i < n; ++i) node = nodes[i], tree.visit(apply);
+  }
+
+  function initialize() {
+    if (!nodes) return;
+    var i, n = nodes.length, node;
+    strengths = new Array(n);
+    for (i = 0; i < n; ++i) node = nodes[i], strengths[node.index] = +strength(node, i, nodes);
+  }
+
+  function accumulate(quad) {
+    var strength = 0, q, c, x$$1, y$$1, i;
+
+    // For internal nodes, accumulate forces from child quadrants.
+    if (quad.length) {
+      for (x$$1 = y$$1 = i = 0; i < 4; ++i) {
+        if ((q = quad[i]) && (c = q.value)) {
+          strength += c, x$$1 += c * q.x, y$$1 += c * q.y;
+        }
+      }
+      quad.x = x$$1 / strength;
+      quad.y = y$$1 / strength;
+    }
+
+    // For leaf nodes, accumulate forces from coincident quadrants.
+    else {
+      q = quad;
+      q.x = q.data.x;
+      q.y = q.data.y;
+      do strength += strengths[q.data.index];
+      while (q = q.next);
+    }
+
+    quad.value = strength;
+  }
+
+  function apply(quad, x1, _, x2) {
+    if (!quad.value) return true;
+
+    var x$$1 = quad.x - node.x,
+        y$$1 = quad.y - node.y,
+        w = x2 - x1,
+        l = x$$1 * x$$1 + y$$1 * y$$1;
+
+    // Apply the Barnes-Hut approximation if possible.
+    // Limit forces for very close nodes; randomize direction if coincident.
+    if (w * w / theta2 < l) {
+      if (l < distanceMax2) {
+        if (x$$1 === 0) x$$1 = jiggle(), l += x$$1 * x$$1;
+        if (y$$1 === 0) y$$1 = jiggle(), l += y$$1 * y$$1;
+        if (l < distanceMin2) l = Math.sqrt(distanceMin2 * l);
+        node.vx += x$$1 * quad.value * alpha / l;
+        node.vy += y$$1 * quad.value * alpha / l;
+      }
+      return true;
+    }
+
+    // Otherwise, process points directly.
+    else if (quad.length || l >= distanceMax2) return;
+
+    // Limit forces for very close nodes; randomize direction if coincident.
+    if (quad.data !== node || quad.next) {
+      if (x$$1 === 0) x$$1 = jiggle(), l += x$$1 * x$$1;
+      if (y$$1 === 0) y$$1 = jiggle(), l += y$$1 * y$$1;
+      if (l < distanceMin2) l = Math.sqrt(distanceMin2 * l);
+    }
+
+    do if (quad.data !== node) {
+      w = strengths[quad.data.index] * alpha / l;
+      node.vx += x$$1 * w;
+      node.vy += y$$1 * w;
+    } while (quad = quad.next);
+  }
+
+  force.initialize = function(_) {
+    nodes = _;
+    initialize();
+  };
+
+  force.strength = function(_) {
+    return arguments.length ? (strength = typeof _ === "function" ? _ : constant$6(+_), initialize(), force) : strength;
+  };
+
+  force.distanceMin = function(_) {
+    return arguments.length ? (distanceMin2 = _ * _, force) : Math.sqrt(distanceMin2);
+  };
+
+  force.distanceMax = function(_) {
+    return arguments.length ? (distanceMax2 = _ * _, force) : Math.sqrt(distanceMax2);
+  };
+
+  force.theta = function(_) {
+    return arguments.length ? (theta2 = _ * _, force) : Math.sqrt(theta2);
+  };
+
+  return force;
+};
+
+var x$2 = function(x) {
+  var strength = constant$6(0.1),
+      nodes,
+      strengths,
+      xz;
+
+  if (typeof x !== "function") x = constant$6(x == null ? 0 : +x);
+
+  function force(alpha) {
+    for (var i = 0, n = nodes.length, node; i < n; ++i) {
+      node = nodes[i], node.vx += (xz[i] - node.x) * strengths[i] * alpha;
+    }
+  }
+
+  function initialize() {
+    if (!nodes) return;
+    var i, n = nodes.length;
+    strengths = new Array(n);
+    xz = new Array(n);
+    for (i = 0; i < n; ++i) {
+      strengths[i] = isNaN(xz[i] = +x(nodes[i], i, nodes)) ? 0 : +strength(nodes[i], i, nodes);
+    }
+  }
+
+  force.initialize = function(_) {
+    nodes = _;
+    initialize();
+  };
+
+  force.strength = function(_) {
+    return arguments.length ? (strength = typeof _ === "function" ? _ : constant$6(+_), initialize(), force) : strength;
+  };
+
+  force.x = function(_) {
+    return arguments.length ? (x = typeof _ === "function" ? _ : constant$6(+_), initialize(), force) : x;
+  };
+
+  return force;
+};
+
+var y$2 = function(y) {
+  var strength = constant$6(0.1),
+      nodes,
+      strengths,
+      yz;
+
+  if (typeof y !== "function") y = constant$6(y == null ? 0 : +y);
+
+  function force(alpha) {
+    for (var i = 0, n = nodes.length, node; i < n; ++i) {
+      node = nodes[i], node.vy += (yz[i] - node.y) * strengths[i] * alpha;
+    }
+  }
+
+  function initialize() {
+    if (!nodes) return;
+    var i, n = nodes.length;
+    strengths = new Array(n);
+    yz = new Array(n);
+    for (i = 0; i < n; ++i) {
+      strengths[i] = isNaN(yz[i] = +y(nodes[i], i, nodes)) ? 0 : +strength(nodes[i], i, nodes);
+    }
+  }
+
+  force.initialize = function(_) {
+    nodes = _;
+    initialize();
+  };
+
+  force.strength = function(_) {
+    return arguments.length ? (strength = typeof _ === "function" ? _ : constant$6(+_), initialize(), force) : strength;
+  };
+
+  force.y = function(_) {
+    return arguments.length ? (y = typeof _ === "function" ? _ : constant$6(+_), initialize(), force) : y;
+  };
+
+  return force;
+};
+
+// Computes the decimal coefficient and exponent of the specified number x with
+// significant digits p, where x is positive and p is in [1, 21] or undefined.
+// For example, formatDecimal(1.23) returns ["123", 0].
+var formatDecimal = function(x, p) {
+  if ((i = (x = p ? x.toExponential(p - 1) : x.toExponential()).indexOf("e")) < 0) return null; // NaN, ±Infinity
+  var i, coefficient = x.slice(0, i);
+
+  // The string returned by toExponential either has the form \d\.\d+e[-+]\d+
+  // (e.g., 1.2e+3) or the form \de[-+]\d+ (e.g., 1e+3).
+  return [
+    coefficient.length > 1 ? coefficient[0] + coefficient.slice(2) : coefficient,
+    +x.slice(i + 1)
+  ];
+};
+
+var exponent$1 = function(x) {
+  return x = formatDecimal(Math.abs(x)), x ? x[1] : NaN;
+};
+
+var formatGroup = function(grouping, thousands) {
+  return function(value, width) {
+    var i = value.length,
+        t = [],
+        j = 0,
+        g = grouping[0],
+        length = 0;
+
+    while (i > 0 && g > 0) {
+      if (length + g + 1 > width) g = Math.max(1, width - length);
+      t.push(value.substring(i -= g, i + g));
+      if ((length += g + 1) > width) break;
+      g = grouping[j = (j + 1) % grouping.length];
+    }
+
+    return t.reverse().join(thousands);
+  };
+};
+
+var formatNumerals = function(numerals) {
+  return function(value) {
+    return value.replace(/[0-9]/g, function(i) {
+      return numerals[+i];
+    });
+  };
+};
+
+var formatDefault = function(x, p) {
+  x = x.toPrecision(p);
+
+  out: for (var n = x.length, i = 1, i0 = -1, i1; i < n; ++i) {
+    switch (x[i]) {
+      case ".": i0 = i1 = i; break;
+      case "0": if (i0 === 0) i0 = i; i1 = i; break;
+      case "e": break out;
+      default: if (i0 > 0) i0 = 0; break;
+    }
+  }
+
+  return i0 > 0 ? x.slice(0, i0) + x.slice(i1 + 1) : x;
+};
+
+var prefixExponent;
+
+var formatPrefixAuto = function(x, p) {
+  var d = formatDecimal(x, p);
+  if (!d) return x + "";
+  var coefficient = d[0],
+      exponent = d[1],
+      i = exponent - (prefixExponent = Math.max(-8, Math.min(8, Math.floor(exponent / 3))) * 3) + 1,
+      n = coefficient.length;
+  return i === n ? coefficient
+      : i > n ? coefficient + new Array(i - n + 1).join("0")
+      : i > 0 ? coefficient.slice(0, i) + "." + coefficient.slice(i)
+      : "0." + new Array(1 - i).join("0") + formatDecimal(x, Math.max(0, p + i - 1))[0]; // less than 1y!
+};
+
+var formatRounded = function(x, p) {
+  var d = formatDecimal(x, p);
+  if (!d) return x + "";
+  var coefficient = d[0],
+      exponent = d[1];
+  return exponent < 0 ? "0." + new Array(-exponent).join("0") + coefficient
+      : coefficient.length > exponent + 1 ? coefficient.slice(0, exponent + 1) + "." + coefficient.slice(exponent + 1)
+      : coefficient + new Array(exponent - coefficient.length + 2).join("0");
+};
+
+var formatTypes = {
+  "": formatDefault,
+  "%": function(x, p) { return (x * 100).toFixed(p); },
+  "b": function(x) { return Math.round(x).toString(2); },
+  "c": function(x) { return x + ""; },
+  "d": function(x) { return Math.round(x).toString(10); },
+  "e": function(x, p) { return x.toExponential(p); },
+  "f": function(x, p) { return x.toFixed(p); },
+  "g": function(x, p) { return x.toPrecision(p); },
+  "o": function(x) { return Math.round(x).toString(8); },
+  "p": function(x, p) { return formatRounded(x * 100, p); },
+  "r": formatRounded,
+  "s": formatPrefixAuto,
+  "X": function(x) { return Math.round(x).toString(16).toUpperCase(); },
+  "x": function(x) { return Math.round(x).toString(16); }
+};
+
+// [[fill]align][sign][symbol][0][width][,][.precision][type]
+var re = /^(?:(.)?([<>=^]))?([+\-\( ])?([$#])?(0)?(\d+)?(,)?(\.\d+)?([a-z%])?$/i;
+
+function formatSpecifier(specifier) {
+  return new FormatSpecifier(specifier);
+}
+
+formatSpecifier.prototype = FormatSpecifier.prototype; // instanceof
+
+function FormatSpecifier(specifier) {
+  if (!(match = re.exec(specifier))) throw new Error("invalid format: " + specifier);
+
+  var match,
+      fill = match[1] || " ",
+      align = match[2] || ">",
+      sign = match[3] || "-",
+      symbol = match[4] || "",
+      zero = !!match[5],
+      width = match[6] && +match[6],
+      comma = !!match[7],
+      precision = match[8] && +match[8].slice(1),
+      type = match[9] || "";
+
+  // The "n" type is an alias for ",g".
+  if (type === "n") comma = true, type = "g";
+
+  // Map invalid types to the default format.
+  else if (!formatTypes[type]) type = "";
+
+  // If zero fill is specified, padding goes after sign and before digits.
+  if (zero || (fill === "0" && align === "=")) zero = true, fill = "0", align = "=";
+
+  this.fill = fill;
+  this.align = align;
+  this.sign = sign;
+  this.symbol = symbol;
+  this.zero = zero;
+  this.width = width;
+  this.comma = comma;
+  this.precision = precision;
+  this.type = type;
+}
+
+FormatSpecifier.prototype.toString = function() {
+  return this.fill
+      + this.align
+      + this.sign
+      + this.symbol
+      + (this.zero ? "0" : "")
+      + (this.width == null ? "" : Math.max(1, this.width | 0))
+      + (this.comma ? "," : "")
+      + (this.precision == null ? "" : "." + Math.max(0, this.precision | 0))
+      + this.type;
+};
+
+var identity$3 = function(x) {
+  return x;
+};
+
+var prefixes = ["y","z","a","f","p","n","\xB5","m","","k","M","G","T","P","E","Z","Y"];
+
+var formatLocale = function(locale) {
+  var group = locale.grouping && locale.thousands ? formatGroup(locale.grouping, locale.thousands) : identity$3,
+      currency = locale.currency,
+      decimal = locale.decimal,
+      numerals = locale.numerals ? formatNumerals(locale.numerals) : identity$3,
+      percent = locale.percent || "%";
+
+  function newFormat(specifier) {
+    specifier = formatSpecifier(specifier);
+
+    var fill = specifier.fill,
+        align = specifier.align,
+        sign = specifier.sign,
+        symbol = specifier.symbol,
+        zero = specifier.zero,
+        width = specifier.width,
+        comma = specifier.comma,
+        precision = specifier.precision,
+        type = specifier.type;
+
+    // Compute the prefix and suffix.
+    // For SI-prefix, the suffix is lazily computed.
+    var prefix = symbol === "$" ? currency[0] : symbol === "#" && /[boxX]/.test(type) ? "0" + type.toLowerCase() : "",
+        suffix = symbol === "$" ? currency[1] : /[%p]/.test(type) ? percent : "";
+
+    // What format function should we use?
+    // Is this an integer type?
+    // Can this type generate exponential notation?
+    var formatType = formatTypes[type],
+        maybeSuffix = !type || /[defgprs%]/.test(type);
+
+    // Set the default precision if not specified,
+    // or clamp the specified precision to the supported range.
+    // For significant precision, it must be in [1, 21].
+    // For fixed precision, it must be in [0, 20].
+    precision = precision == null ? (type ? 6 : 12)
+        : /[gprs]/.test(type) ? Math.max(1, Math.min(21, precision))
+        : Math.max(0, Math.min(20, precision));
+
+    function format(value) {
+      var valuePrefix = prefix,
+          valueSuffix = suffix,
+          i, n, c;
+
+      if (type === "c") {
+        valueSuffix = formatType(value) + valueSuffix;
+        value = "";
       } else {
-        dispatch.error.call(xhr, request);
-      }
-    }
-    request.onprogress = function(event) {
-      var o = d3.event;
-      d3.event = event;
-      try {
-        dispatch.progress.call(xhr, request);
-      } finally {
-        d3.event = o;
-      }
-    };
-    xhr.header = function(name, value) {
-      name = (name + "").toLowerCase();
-      if (arguments.length < 2) return headers[name];
-      if (value == null) delete headers[name]; else headers[name] = value + "";
-      return xhr;
-    };
-    xhr.mimeType = function(value) {
-      if (!arguments.length) return mimeType;
-      mimeType = value == null ? null : value + "";
-      return xhr;
-    };
-    xhr.responseType = function(value) {
-      if (!arguments.length) return responseType;
-      responseType = value;
-      return xhr;
-    };
-    xhr.response = function(value) {
-      response = value;
-      return xhr;
-    };
-    [ "get", "post" ].forEach(function(method) {
-      xhr[method] = function() {
-        return xhr.send.apply(xhr, [ method ].concat(d3_array(arguments)));
-      };
-    });
-    xhr.send = function(method, data, callback) {
-      if (arguments.length === 2 && typeof data === "function") callback = data, data = null;
-      request.open(method, url, true);
-      if (mimeType != null && !("accept" in headers)) headers["accept"] = mimeType + ",*/*";
-      if (request.setRequestHeader) for (var name in headers) request.setRequestHeader(name, headers[name]);
-      if (mimeType != null && request.overrideMimeType) request.overrideMimeType(mimeType);
-      if (responseType != null) request.responseType = responseType;
-      if (callback != null) xhr.on("error", callback).on("load", function(request) {
-        callback(null, request);
-      });
-      dispatch.beforesend.call(xhr, request);
-      request.send(data == null ? null : data);
-      return xhr;
-    };
-    xhr.abort = function() {
-      request.abort();
-      return xhr;
-    };
-    d3.rebind(xhr, dispatch, "on");
-    return callback == null ? xhr : xhr.get(d3_xhr_fixCallback(callback));
-  }
-  function d3_xhr_fixCallback(callback) {
-    return callback.length === 1 ? function(error, request) {
-      callback(error == null ? request : null);
-    } : callback;
-  }
-  d3.dsv = function(delimiter, mimeType) {
-    var reFormat = new RegExp('["' + delimiter + "\n]"), delimiterCode = delimiter.charCodeAt(0);
-    function dsv(url, row, callback) {
-      if (arguments.length < 3) callback = row, row = null;
-      var xhr = d3_xhr(url, mimeType, row == null ? response : typedResponse(row), callback);
-      xhr.row = function(_) {
-        return arguments.length ? xhr.response((row = _) == null ? response : typedResponse(_)) : row;
-      };
-      return xhr;
-    }
-    function response(request) {
-      return dsv.parse(request.responseText);
-    }
-    function typedResponse(f) {
-      return function(request) {
-        return dsv.parse(request.responseText, f);
-      };
-    }
-    dsv.parse = function(text, f) {
-      var o;
-      return dsv.parseRows(text, function(row, i) {
-        if (o) return o(row, i - 1);
-        var a = new Function("d", "return {" + row.map(function(name, i) {
-          return JSON.stringify(name) + ": d[" + i + "]";
-        }).join(",") + "}");
-        o = f ? function(row, i) {
-          return f(a(row), i);
-        } : a;
-      });
-    };
-    dsv.parseRows = function(text, f) {
-      var EOL = {}, EOF = {}, rows = [], N = text.length, I = 0, n = 0, t, eol;
-      function token() {
-        if (I >= N) return EOF;
-        if (eol) return eol = false, EOL;
-        var j = I;
-        if (text.charCodeAt(j) === 34) {
-          var i = j;
-          while (i++ < N) {
-            if (text.charCodeAt(i) === 34) {
-              if (text.charCodeAt(i + 1) !== 34) break;
-              ++i;
+        value = +value;
+
+        // Perform the initial formatting.
+        var valueNegative = value < 0;
+        value = formatType(Math.abs(value), precision);
+
+        // If a negative value rounds to zero during formatting, treat as positive.
+        if (valueNegative && +value === 0) valueNegative = false;
+
+        // Compute the prefix and suffix.
+        valuePrefix = (valueNegative ? (sign === "(" ? sign : "-") : sign === "-" || sign === "(" ? "" : sign) + valuePrefix;
+        valueSuffix = valueSuffix + (type === "s" ? prefixes[8 + prefixExponent / 3] : "") + (valueNegative && sign === "(" ? ")" : "");
+
+        // Break the formatted value into the integer “value” part that can be
+        // grouped, and fractional or exponential “suffix” part that is not.
+        if (maybeSuffix) {
+          i = -1, n = value.length;
+          while (++i < n) {
+            if (c = value.charCodeAt(i), 48 > c || c > 57) {
+              valueSuffix = (c === 46 ? decimal + value.slice(i + 1) : value.slice(i)) + valueSuffix;
+              value = value.slice(0, i);
+              break;
             }
           }
-          I = i + 2;
-          var c = text.charCodeAt(i + 1);
-          if (c === 13) {
-            eol = true;
-            if (text.charCodeAt(i + 2) === 10) ++I;
-          } else if (c === 10) {
-            eol = true;
-          }
-          return text.substring(j + 1, i).replace(/""/g, '"');
-        }
-        while (I < N) {
-          var c = text.charCodeAt(I++), k = 1;
-          if (c === 10) eol = true; else if (c === 13) {
-            eol = true;
-            if (text.charCodeAt(I) === 10) ++I, ++k;
-          } else if (c !== delimiterCode) continue;
-          return text.substring(j, I - k);
-        }
-        return text.substring(j);
-      }
-      while ((t = token()) !== EOF) {
-        var a = [];
-        while (t !== EOL && t !== EOF) {
-          a.push(t);
-          t = token();
-        }
-        if (f && !(a = f(a, n++))) continue;
-        rows.push(a);
-      }
-      return rows;
-    };
-    dsv.format = function(rows) {
-      if (Array.isArray(rows[0])) return dsv.formatRows(rows);
-      var fieldSet = new d3_Set(), fields = [];
-      rows.forEach(function(row) {
-        for (var field in row) {
-          if (!fieldSet.has(field)) {
-            fields.push(fieldSet.add(field));
-          }
-        }
-      });
-      return [ fields.map(formatValue).join(delimiter) ].concat(rows.map(function(row) {
-        return fields.map(function(field) {
-          return formatValue(row[field]);
-        }).join(delimiter);
-      })).join("\n");
-    };
-    dsv.formatRows = function(rows) {
-      return rows.map(formatRow).join("\n");
+        }
+      }
+
+      // If the fill character is not "0", grouping is applied before padding.
+      if (comma && !zero) value = group(value, Infinity);
+
+      // Compute the padding.
+      var length = valuePrefix.length + value.length + valueSuffix.length,
+          padding = length < width ? new Array(width - length + 1).join(fill) : "";
+
+      // If the fill character is "0", grouping is applied after padding.
+      if (comma && zero) value = group(padding + value, padding.length ? width - valueSuffix.length : Infinity), padding = "";
+
+      // Reconstruct the final output based on the desired alignment.
+      switch (align) {
+        case "<": value = valuePrefix + value + valueSuffix + padding; break;
+        case "=": value = valuePrefix + padding + value + valueSuffix; break;
+        case "^": value = padding.slice(0, length = padding.length >> 1) + valuePrefix + value + valueSuffix + padding.slice(length); break;
+        default: value = padding + valuePrefix + value + valueSuffix; break;
+      }
+
+      return numerals(value);
+    }
+
+    format.toString = function() {
+      return specifier + "";
     };
-    function formatRow(row) {
-      return row.map(formatValue).join(delimiter);
-    }
-    function formatValue(text) {
-      return reFormat.test(text) ? '"' + text.replace(/\"/g, '""') + '"' : text;
-    }
-    return dsv;
-  };
-  d3.csv = d3.dsv(",", "text/csv");
-  d3.tsv = d3.dsv("	", "text/tab-separated-values");
-  d3.touch = function(container, touches, identifier) {
-    if (arguments.length < 3) identifier = touches, touches = d3_eventSource().changedTouches;
-    if (touches) for (var i = 0, n = touches.length, touch; i < n; ++i) {
-      if ((touch = touches[i]).identifier === identifier) {
-        return d3_mousePoint(container, touch);
-      }
-    }
-  };
-  var d3_timer_queueHead, d3_timer_queueTail, d3_timer_interval, d3_timer_timeout, d3_timer_active, d3_timer_frame = d3_window[d3_vendorSymbol(d3_window, "requestAnimationFrame")] || function(callback) {
-    setTimeout(callback, 17);
-  };
-  d3.timer = function(callback, delay, then) {
-    var n = arguments.length;
-    if (n < 2) delay = 0;
-    if (n < 3) then = Date.now();
-    var time = then + delay, timer = {
-      c: callback,
-      t: time,
-      f: false,
-      n: null
-    };
-    if (d3_timer_queueTail) d3_timer_queueTail.n = timer; else d3_timer_queueHead = timer;
-    d3_timer_queueTail = timer;
-    if (!d3_timer_interval) {
-      d3_timer_timeout = clearTimeout(d3_timer_timeout);
-      d3_timer_interval = 1;
-      d3_timer_frame(d3_timer_step);
-    }
-  };
-  function d3_timer_step() {
-    var now = d3_timer_mark(), delay = d3_timer_sweep() - now;
-    if (delay > 24) {
-      if (isFinite(delay)) {
-        clearTimeout(d3_timer_timeout);
-        d3_timer_timeout = setTimeout(d3_timer_step, delay);
-      }
-      d3_timer_interval = 0;
-    } else {
-      d3_timer_interval = 1;
-      d3_timer_frame(d3_timer_step);
-    }
-  }
-  d3.timer.flush = function() {
-    d3_timer_mark();
-    d3_timer_sweep();
-  };
-  function d3_timer_mark() {
-    var now = Date.now();
-    d3_timer_active = d3_timer_queueHead;
-    while (d3_timer_active) {
-      if (now >= d3_timer_active.t) d3_timer_active.f = d3_timer_active.c(now - d3_timer_active.t);
-      d3_timer_active = d3_timer_active.n;
-    }
-    return now;
-  }
-  function d3_timer_sweep() {
-    var t0, t1 = d3_timer_queueHead, time = Infinity;
-    while (t1) {
-      if (t1.f) {
-        t1 = t0 ? t0.n = t1.n : d3_timer_queueHead = t1.n;
-      } else {
-        if (t1.t < time) time = t1.t;
-        t1 = (t0 = t1).n;
-      }
-    }
-    d3_timer_queueTail = t0;
-    return time;
-  }
-  function d3_format_precision(x, p) {
-    return p - (x ? Math.ceil(Math.log(x) / Math.LN10) : 1);
-  }
-  d3.round = function(x, n) {
-    return n ? Math.round(x * (n = Math.pow(10, n))) / n : Math.round(x);
-  };
-  var d3_formatPrefixes = [ "y", "z", "a", "f", "p", "n", "µ", "m", "", "k", "M", "G", "T", "P", "E", "Z", "Y" ].map(d3_formatPrefix);
-  d3.formatPrefix = function(value, precision) {
-    var i = 0;
-    if (value) {
-      if (value < 0) value *= -1;
-      if (precision) value = d3.round(value, d3_format_precision(value, precision));
-      i = 1 + Math.floor(1e-12 + Math.log(value) / Math.LN10);
-      i = Math.max(-24, Math.min(24, Math.floor((i - 1) / 3) * 3));
-    }
-    return d3_formatPrefixes[8 + i / 3];
-  };
-  function d3_formatPrefix(d, i) {
-    var k = Math.pow(10, abs(8 - i) * 3);
-    return {
-      scale: i > 8 ? function(d) {
-        return d / k;
-      } : function(d) {
-        return d * k;
-      },
-      symbol: d
+
+    return format;
+  }
+
+  function formatPrefix(specifier, value) {
+    var f = newFormat((specifier = formatSpecifier(specifier), specifier.type = "f", specifier)),
+        e = Math.max(-8, Math.min(8, Math.floor(exponent$1(value) / 3))) * 3,
+        k = Math.pow(10, -e),
+        prefix = prefixes[8 + e / 3];
+    return function(value) {
+      return f(k * value) + prefix;
     };
   }
-  function d3_locale_numberFormat(locale) {
-    var locale_decimal = locale.decimal, locale_thousands = locale.thousands, locale_grouping = locale.grouping, locale_currency = locale.currency, formatGroup = locale_grouping ? function(value) {
-      var i = value.length, t = [], j = 0, g = locale_grouping[0];
-      while (i > 0 && g > 0) {
-        t.push(value.substring(i -= g, i + g));
-        g = locale_grouping[j = (j + 1) % locale_grouping.length];
-      }
-      return t.reverse().join(locale_thousands);
-    } : d3_identity;
-    return function(specifier) {
-      var match = d3_format_re.exec(specifier), fill = match[1] || " ", align = match[2] || ">", sign = match[3] || "", symbol = match[4] || "", zfill = match[5], width = +match[6], comma = match[7], precision = match[8], type = match[9], scale = 1, prefix = "", suffix = "", integer = false;
-      if (precision) precision = +precision.substring(1);
-      if (zfill || fill === "0" && align === "=") {
-        zfill = fill = "0";
-        align = "=";
-        if (comma) width -= Math.floor((width - 1) / 4);
-      }
-      switch (type) {
-       case "n":
-        comma = true;
-        type = "g";
-        break;
-
-       case "%":
-        scale = 100;
-        suffix = "%";
-        type = "f";
-        break;
-
-       case "p":
-        scale = 100;
-        suffix = "%";
-        type = "r";
-        break;
-
-       case "b":
-       case "o":
-       case "x":
-       case "X":
-        if (symbol === "#") prefix = "0" + type.toLowerCase();
-
-       case "c":
-       case "d":
-        integer = true;
-        precision = 0;
-        break;
-
-       case "s":
-        scale = -1;
-        type = "r";
-        break;
-      }
-      if (symbol === "$") prefix = locale_currency[0], suffix = locale_currency[1];
-      if (type == "r" && !precision) type = "g";
-      if (precision != null) {
-        if (type == "g") precision = Math.max(1, Math.min(21, precision)); else if (type == "e" || type == "f") precision = Math.max(0, Math.min(20, precision));
-      }
-      type = d3_format_types.get(type) || d3_format_typeDefault;
-      var zcomma = zfill && comma;
-      return function(value) {
-        var fullSuffix = suffix;
-        if (integer && value % 1) return "";
-        var negative = value < 0 || value === 0 && 1 / value < 0 ? (value = -value, "-") : sign;
-        if (scale < 0) {
-          var unit = d3.formatPrefix(value, precision);
-          value = unit.scale(value);
-          fullSuffix = unit.symbol + suffix;
+
+  return {
+    format: newFormat,
+    formatPrefix: formatPrefix
+  };
+};
+
+var locale$1;
+
+
+
+defaultLocale({
+  decimal: ".",
+  thousands: ",",
+  grouping: [3],
+  currency: ["$", ""]
+});
+
+function defaultLocale(definition) {
+  locale$1 = formatLocale(definition);
+  exports.format = locale$1.format;
+  exports.formatPrefix = locale$1.formatPrefix;
+  return locale$1;
+}
+
+var precisionFixed = function(step) {
+  return Math.max(0, -exponent$1(Math.abs(step)));
+};
+
+var precisionPrefix = function(step, value) {
+  return Math.max(0, Math.max(-8, Math.min(8, Math.floor(exponent$1(value) / 3))) * 3 - exponent$1(Math.abs(step)));
+};
+
+var precisionRound = function(step, max) {
+  step = Math.abs(step), max = Math.abs(max) - step;
+  return Math.max(0, exponent$1(max) - exponent$1(step)) + 1;
+};
+
+// Adds floating point numbers with twice the normal precision.
+// Reference: J. R. Shewchuk, Adaptive Precision Floating-Point Arithmetic and
+// Fast Robust Geometric Predicates, Discrete & Computational Geometry 18(3)
+// 305–363 (1997).
+// Code adapted from GeographicLib by Charles F. F. Karney,
+// http://geographiclib.sourceforge.net/
+
+var adder = function() {
+  return new Adder;
+};
+
+function Adder() {
+  this.reset();
+}
+
+Adder.prototype = {
+  constructor: Adder,
+  reset: function() {
+    this.s = // rounded value
+    this.t = 0; // exact error
+  },
+  add: function(y) {
+    add$1(temp, y, this.t);
+    add$1(this, temp.s, this.s);
+    if (this.s) this.t += temp.t;
+    else this.s = temp.t;
+  },
+  valueOf: function() {
+    return this.s;
+  }
+};
+
+var temp = new Adder;
+
+function add$1(adder, a, b) {
+  var x = adder.s = a + b,
+      bv = x - a,
+      av = x - bv;
+  adder.t = (a - av) + (b - bv);
+}
+
+var epsilon$2 = 1e-6;
+var epsilon2$1 = 1e-12;
+var pi$3 = Math.PI;
+var halfPi$2 = pi$3 / 2;
+var quarterPi = pi$3 / 4;
+var tau$3 = pi$3 * 2;
+
+var degrees$1 = 180 / pi$3;
+var radians = pi$3 / 180;
+
+var abs = Math.abs;
+var atan = Math.atan;
+var atan2 = Math.atan2;
+var cos$1 = Math.cos;
+var ceil = Math.ceil;
+var exp = Math.exp;
+
+var log = Math.log;
+var pow = Math.pow;
+var sin$1 = Math.sin;
+var sign = Math.sign || function(x) { return x > 0 ? 1 : x < 0 ? -1 : 0; };
+var sqrt = Math.sqrt;
+var tan = Math.tan;
+
+function acos(x) {
+  return x > 1 ? 0 : x < -1 ? pi$3 : Math.acos(x);
+}
+
+function asin(x) {
+  return x > 1 ? halfPi$2 : x < -1 ? -halfPi$2 : Math.asin(x);
+}
+
+function haversin(x) {
+  return (x = sin$1(x / 2)) * x;
+}
+
+function noop$1() {}
+
+function streamGeometry(geometry, stream) {
+  if (geometry && streamGeometryType.hasOwnProperty(geometry.type)) {
+    streamGeometryType[geometry.type](geometry, stream);
+  }
+}
+
+var streamObjectType = {
+  Feature: function(object, stream) {
+    streamGeometry(object.geometry, stream);
+  },
+  FeatureCollection: function(object, stream) {
+    var features = object.features, i = -1, n = features.length;
+    while (++i < n) streamGeometry(features[i].geometry, stream);
+  }
+};
+
+var streamGeometryType = {
+  Sphere: function(object, stream) {
+    stream.sphere();
+  },
+  Point: function(object, stream) {
+    object = object.coordinates;
+    stream.point(object[0], object[1], object[2]);
+  },
+  MultiPoint: function(object, stream) {
+    var coordinates = object.coordinates, i = -1, n = coordinates.length;
+    while (++i < n) object = coordinates[i], stream.point(object[0], object[1], object[2]);
+  },
+  LineString: function(object, stream) {
+    streamLine(object.coordinates, stream, 0);
+  },
+  MultiLineString: function(object, stream) {
+    var coordinates = object.coordinates, i = -1, n = coordinates.length;
+    while (++i < n) streamLine(coordinates[i], stream, 0);
+  },
+  Polygon: function(object, stream) {
+    streamPolygon(object.coordinates, stream);
+  },
+  MultiPolygon: function(object, stream) {
+    var coordinates = object.coordinates, i = -1, n = coordinates.length;
+    while (++i < n) streamPolygon(coordinates[i], stream);
+  },
+  GeometryCollection: function(object, stream) {
+    var geometries = object.geometries, i = -1, n = geometries.length;
+    while (++i < n) streamGeometry(geometries[i], stream);
+  }
+};
+
+function streamLine(coordinates, stream, closed) {
+  var i = -1, n = coordinates.length - closed, coordinate;
+  stream.lineStart();
+  while (++i < n) coordinate = coordinates[i], stream.point(coordinate[0], coordinate[1], coordinate[2]);
+  stream.lineEnd();
+}
+
+function streamPolygon(coordinates, stream) {
+  var i = -1, n = coordinates.length;
+  stream.polygonStart();
+  while (++i < n) streamLine(coordinates[i], stream, 1);
+  stream.polygonEnd();
+}
+
+var geoStream = function(object, stream) {
+  if (object && streamObjectType.hasOwnProperty(object.type)) {
+    streamObjectType[object.type](object, stream);
+  } else {
+    streamGeometry(object, stream);
+  }
+};
+
+var areaRingSum = adder();
+
+var areaSum = adder();
+var lambda00;
+var phi00;
+var lambda0;
+var cosPhi0;
+var sinPhi0;
+
+var areaStream = {
+  point: noop$1,
+  lineStart: noop$1,
+  lineEnd: noop$1,
+  polygonStart: function() {
+    areaRingSum.reset();
+    areaStream.lineStart = areaRingStart;
+    areaStream.lineEnd = areaRingEnd;
+  },
+  polygonEnd: function() {
+    var areaRing = +areaRingSum;
+    areaSum.add(areaRing < 0 ? tau$3 + areaRing : areaRing);
+    this.lineStart = this.lineEnd = this.point = noop$1;
+  },
+  sphere: function() {
+    areaSum.add(tau$3);
+  }
+};
+
+function areaRingStart() {
+  areaStream.point = areaPointFirst;
+}
+
+function areaRingEnd() {
+  areaPoint(lambda00, phi00);
+}
+
+function areaPointFirst(lambda, phi) {
+  areaStream.point = areaPoint;
+  lambda00 = lambda, phi00 = phi;
+  lambda *= radians, phi *= radians;
+  lambda0 = lambda, cosPhi0 = cos$1(phi = phi / 2 + quarterPi), sinPhi0 = sin$1(phi);
+}
+
+function areaPoint(lambda, phi) {
+  lambda *= radians, phi *= radians;
+  phi = phi / 2 + quarterPi; // half the angular distance from south pole
+
+  // Spherical excess E for a spherical triangle with vertices: south pole,
+  // previous point, current point.  Uses a formula derived from Cagnoli’s
+  // theorem.  See Todhunter, Spherical Trig. (1871), Sec. 103, Eq. (2).
+  var dLambda = lambda - lambda0,
+      sdLambda = dLambda >= 0 ? 1 : -1,
+      adLambda = sdLambda * dLambda,
+      cosPhi = cos$1(phi),
+      sinPhi = sin$1(phi),
+      k = sinPhi0 * sinPhi,
+      u = cosPhi0 * cosPhi + k * cos$1(adLambda),
+      v = k * sdLambda * sin$1(adLambda);
+  areaRingSum.add(atan2(v, u));
+
+  // Advance the previous points.
+  lambda0 = lambda, cosPhi0 = cosPhi, sinPhi0 = sinPhi;
+}
+
+var area = function(object) {
+  areaSum.reset();
+  geoStream(object, areaStream);
+  return areaSum * 2;
+};
+
+function spherical(cartesian) {
+  return [atan2(cartesian[1], cartesian[0]), asin(cartesian[2])];
+}
+
+function cartesian(spherical) {
+  var lambda = spherical[0], phi = spherical[1], cosPhi = cos$1(phi);
+  return [cosPhi * cos$1(lambda), cosPhi * sin$1(lambda), sin$1(phi)];
+}
+
+function cartesianDot(a, b) {
+  return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
+}
+
+function cartesianCross(a, b) {
+  return [a[1] * b[2] - a[2] * b[1], a[2] * b[0] - a[0] * b[2], a[0] * b[1] - a[1] * b[0]];
+}
+
+// TODO return a
+function cartesianAddInPlace(a, b) {
+  a[0] += b[0], a[1] += b[1], a[2] += b[2];
+}
+
+function cartesianScale(vector, k) {
+  return [vector[0] * k, vector[1] * k, vector[2] * k];
+}
+
+// TODO return d
+function cartesianNormalizeInPlace(d) {
+  var l = sqrt(d[0] * d[0] + d[1] * d[1] + d[2] * d[2]);
+  d[0] /= l, d[1] /= l, d[2] /= l;
+}
+
+var lambda0$1;
+var phi0;
+var lambda1;
+var phi1;
+var lambda2;
+var lambda00$1;
+var phi00$1;
+var p0;
+var deltaSum = adder();
+var ranges;
+var range;
+
+var boundsStream = {
+  point: boundsPoint,
+  lineStart: boundsLineStart,
+  lineEnd: boundsLineEnd,
+  polygonStart: function() {
+    boundsStream.point = boundsRingPoint;
+    boundsStream.lineStart = boundsRingStart;
+    boundsStream.lineEnd = boundsRingEnd;
+    deltaSum.reset();
+    areaStream.polygonStart();
+  },
+  polygonEnd: function() {
+    areaStream.polygonEnd();
+    boundsStream.point = boundsPoint;
+    boundsStream.lineStart = boundsLineStart;
+    boundsStream.lineEnd = boundsLineEnd;
+    if (areaRingSum < 0) lambda0$1 = -(lambda1 = 180), phi0 = -(phi1 = 90);
+    else if (deltaSum > epsilon$2) phi1 = 90;
+    else if (deltaSum < -epsilon$2) phi0 = -90;
+    range[0] = lambda0$1, range[1] = lambda1;
+  }
+};
+
+function boundsPoint(lambda, phi) {
+  ranges.push(range = [lambda0$1 = lambda, lambda1 = lambda]);
+  if (phi < phi0) phi0 = phi;
+  if (phi > phi1) phi1 = phi;
+}
+
+function linePoint(lambda, phi) {
+  var p = cartesian([lambda * radians, phi * radians]);
+  if (p0) {
+    var normal = cartesianCross(p0, p),
+        equatorial = [normal[1], -normal[0], 0],
+        inflection = cartesianCross(equatorial, normal);
+    cartesianNormalizeInPlace(inflection);
+    inflection = spherical(inflection);
+    var delta = lambda - lambda2,
+        sign$$1 = delta > 0 ? 1 : -1,
+        lambdai = inflection[0] * degrees$1 * sign$$1,
+        phii,
+        antimeridian = abs(delta) > 180;
+    if (antimeridian ^ (sign$$1 * lambda2 < lambdai && lambdai < sign$$1 * lambda)) {
+      phii = inflection[1] * degrees$1;
+      if (phii > phi1) phi1 = phii;
+    } else if (lambdai = (lambdai + 360) % 360 - 180, antimeridian ^ (sign$$1 * lambda2 < lambdai && lambdai < sign$$1 * lambda)) {
+      phii = -inflection[1] * degrees$1;
+      if (phii < phi0) phi0 = phii;
+    } else {
+      if (phi < phi0) phi0 = phi;
+      if (phi > phi1) phi1 = phi;
+    }
+    if (antimeridian) {
+      if (lambda < lambda2) {
+        if (angle(lambda0$1, lambda) > angle(lambda0$1, lambda1)) lambda1 = lambda;
+      } else {
+        if (angle(lambda, lambda1) > angle(lambda0$1, lambda1)) lambda0$1 = lambda;
+      }
+    } else {
+      if (lambda1 >= lambda0$1) {
+        if (lambda < lambda0$1) lambda0$1 = lambda;
+        if (lambda > lambda1) lambda1 = lambda;
+      } else {
+        if (lambda > lambda2) {
+          if (angle(lambda0$1, lambda) > angle(lambda0$1, lambda1)) lambda1 = lambda;
         } else {
-          value *= scale;
-        }
-        value = type(value, precision);
-        var i = value.lastIndexOf("."), before = i < 0 ? value : value.substring(0, i), after = i < 0 ? "" : locale_decimal + value.substring(i + 1);
-        if (!zfill && comma) before = formatGroup(before);
-        var length = prefix.length + before.length + after.length + (zcomma ? 0 : negative.length), padding = length < width ? new Array(length = width - length + 1).join(fill) : "";
-        if (zcomma) before = formatGroup(padding + before);
-        negative += prefix;
-        value = before + after;
-        return (align === "<" ? negative + value + padding : align === ">" ? padding + negative + value : align === "^" ? padding.substring(0, length >>= 1) + negative + value + padding.substring(length) : negative + (zcomma ? value : padding + value)) + fullSuffix;
-      };
-    };
-  }
-  var d3_format_re = /(?:([^{])?([<>=^]))?([+\- ])?([$#])?(0)?(\d+)?(,)?(\.-?\d+)?([a-z%])?/i;
-  var d3_format_types = d3.map({
-    b: function(x) {
-      return x.toString(2);
-    },
-    c: function(x) {
-      return String.fromCharCode(x);
-    },
-    o: function(x) {
-      return x.toString(8);
-    },
-    x: function(x) {
-      return x.toString(16);
-    },
-    X: function(x) {
-      return x.toString(16).toUpperCase();
+          if (angle(lambda, lambda1) > angle(lambda0$1, lambda1)) lambda0$1 = lambda;
+        }
+      }
+    }
+  } else {
+    ranges.push(range = [lambda0$1 = lambda, lambda1 = lambda]);
+  }
+  if (phi < phi0) phi0 = phi;
+  if (phi > phi1) phi1 = phi;
+  p0 = p, lambda2 = lambda;
+}
+
+function boundsLineStart() {
+  boundsStream.point = linePoint;
+}
+
+function boundsLineEnd() {
+  range[0] = lambda0$1, range[1] = lambda1;
+  boundsStream.point = boundsPoint;
+  p0 = null;
+}
+
+function boundsRingPoint(lambda, phi) {
+  if (p0) {
+    var delta = lambda - lambda2;
+    deltaSum.add(abs(delta) > 180 ? delta + (delta > 0 ? 360 : -360) : delta);
+  } else {
+    lambda00$1 = lambda, phi00$1 = phi;
+  }
+  areaStream.point(lambda, phi);
+  linePoint(lambda, phi);
+}
+
+function boundsRingStart() {
+  areaStream.lineStart();
+}
+
+function boundsRingEnd() {
+  boundsRingPoint(lambda00$1, phi00$1);
+  areaStream.lineEnd();
+  if (abs(deltaSum) > epsilon$2) lambda0$1 = -(lambda1 = 180);
+  range[0] = lambda0$1, range[1] = lambda1;
+  p0 = null;
+}
+
+// Finds the left-right distance between two longitudes.
+// This is almost the same as (lambda1 - lambda0 + 360°) % 360°, except that we want
+// the distance between ±180° to be 360°.
+function angle(lambda0, lambda1) {
+  return (lambda1 -= lambda0) < 0 ? lambda1 + 360 : lambda1;
+}
+
+function rangeCompare(a, b) {
+  return a[0] - b[0];
+}
+
+function rangeContains(range, x) {
+  return range[0] <= range[1] ? range[0] <= x && x <= range[1] : x < range[0] || range[1] < x;
+}
+
+var bounds = function(feature) {
+  var i, n, a, b, merged, deltaMax, delta;
+
+  phi1 = lambda1 = -(lambda0$1 = phi0 = Infinity);
+  ranges = [];
+  geoStream(feature, boundsStream);
+
+  // First, sort ranges by their minimum longitudes.
+  if (n = ranges.length) {
+    ranges.sort(rangeCompare);
+
+    // Then, merge any ranges that overlap.
+    for (i = 1, a = ranges[0], merged = [a]; i < n; ++i) {
+      b = ranges[i];
+      if (rangeContains(a, b[0]) || rangeContains(a, b[1])) {
+        if (angle(a[0], b[1]) > angle(a[0], a[1])) a[1] = b[1];
+        if (angle(b[0], a[1]) > angle(a[0], a[1])) a[0] = b[0];
+      } else {
+        merged.push(a = b);
+      }
+    }
+
+    // Finally, find the largest gap between the merged ranges.
+    // The final bounding box will be the inverse of this gap.
+    for (deltaMax = -Infinity, n = merged.length - 1, i = 0, a = merged[n]; i <= n; a = b, ++i) {
+      b = merged[i];
+      if ((delta = angle(a[1], b[0])) > deltaMax) deltaMax = delta, lambda0$1 = b[0], lambda1 = a[1];
+    }
+  }
+
+  ranges = range = null;
+
+  return lambda0$1 === Infinity || phi0 === Infinity
+      ? [[NaN, NaN], [NaN, NaN]]
+      : [[lambda0$1, phi0], [lambda1, phi1]];
+};
+
+var W0;
+var W1;
+var X0;
+var Y0;
+var Z0;
+var X1;
+var Y1;
+var Z1;
+var X2;
+var Y2;
+var Z2;
+var lambda00$2;
+var phi00$2;
+var x0;
+var y0;
+var z0; // previous point
+
+var centroidStream = {
+  sphere: noop$1,
+  point: centroidPoint,
+  lineStart: centroidLineStart,
+  lineEnd: centroidLineEnd,
+  polygonStart: function() {
+    centroidStream.lineStart = centroidRingStart;
+    centroidStream.lineEnd = centroidRingEnd;
+  },
+  polygonEnd: function() {
+    centroidStream.lineStart = centroidLineStart;
+    centroidStream.lineEnd = centroidLineEnd;
+  }
+};
+
+// Arithmetic mean of Cartesian vectors.
+function centroidPoint(lambda, phi) {
+  lambda *= radians, phi *= radians;
+  var cosPhi = cos$1(phi);
+  centroidPointCartesian(cosPhi * cos$1(lambda), cosPhi * sin$1(lambda), sin$1(phi));
+}
+
+function centroidPointCartesian(x, y, z) {
+  ++W0;
+  X0 += (x - X0) / W0;
+  Y0 += (y - Y0) / W0;
+  Z0 += (z - Z0) / W0;
+}
+
+function centroidLineStart() {
+  centroidStream.point = centroidLinePointFirst;
+}
+
+function centroidLinePointFirst(lambda, phi) {
+  lambda *= radians, phi *= radians;
+  var cosPhi = cos$1(phi);
+  x0 = cosPhi * cos$1(lambda);
+  y0 = cosPhi * sin$1(lambda);
+  z0 = sin$1(phi);
+  centroidStream.point = centroidLinePoint;
+  centroidPointCartesian(x0, y0, z0);
+}
+
+function centroidLinePoint(lambda, phi) {
+  lambda *= radians, phi *= radians;
+  var cosPhi = cos$1(phi),
+      x = cosPhi * cos$1(lambda),
+      y = cosPhi * sin$1(lambda),
+      z = sin$1(phi),
+      w = atan2(sqrt((w = y0 * z - z0 * y) * w + (w = z0 * x - x0 * z) * w + (w = x0 * y - y0 * x) * w), x0 * x + y0 * y + z0 * z);
+  W1 += w;
+  X1 += w * (x0 + (x0 = x));
+  Y1 += w * (y0 + (y0 = y));
+  Z1 += w * (z0 + (z0 = z));
+  centroidPointCartesian(x0, y0, z0);
+}
+
+function centroidLineEnd() {
+  centroidStream.point = centroidPoint;
+}
+
+// See J. E. Brock, The Inertia Tensor for a Spherical Triangle,
+// J. Applied Mechanics 42, 239 (1975).
+function centroidRingStart() {
+  centroidStream.point = centroidRingPointFirst;
+}
+
+function centroidRingEnd() {
+  centroidRingPoint(lambda00$2, phi00$2);
+  centroidStream.point = centroidPoint;
+}
+
+function centroidRingPointFirst(lambda, phi) {
+  lambda00$2 = lambda, phi00$2 = phi;
+  lambda *= radians, phi *= radians;
+  centroidStream.point = centroidRingPoint;
+  var cosPhi = cos$1(phi);
+  x0 = cosPhi * cos$1(lambda);
+  y0 = cosPhi * sin$1(lambda);
+  z0 = sin$1(phi);
+  centroidPointCartesian(x0, y0, z0);
+}
+
+function centroidRingPoint(lambda, phi) {
+  lambda *= radians, phi *= radians;
+  var cosPhi = cos$1(phi),
+      x = cosPhi * cos$1(lambda),
+      y = cosPhi * sin$1(lambda),
+      z = sin$1(phi),
+      cx = y0 * z - z0 * y,
+      cy = z0 * x - x0 * z,
+      cz = x0 * y - y0 * x,
+      m = sqrt(cx * cx + cy * cy + cz * cz),
+      w = asin(m), // line weight = angle
+      v = m && -w / m; // area weight multiplier
+  X2 += v * cx;
+  Y2 += v * cy;
+  Z2 += v * cz;
+  W1 += w;
+  X1 += w * (x0 + (x0 = x));
+  Y1 += w * (y0 + (y0 = y));
+  Z1 += w * (z0 + (z0 = z));
+  centroidPointCartesian(x0, y0, z0);
+}
+
+var centroid = function(object) {
+  W0 = W1 =
+  X0 = Y0 = Z0 =
+  X1 = Y1 = Z1 =
+  X2 = Y2 = Z2 = 0;
+  geoStream(object, centroidStream);
+
+  var x = X2,
+      y = Y2,
+      z = Z2,
+      m = x * x + y * y + z * z;
+
+  // If the area-weighted ccentroid is undefined, fall back to length-weighted ccentroid.
+  if (m < epsilon2$1) {
+    x = X1, y = Y1, z = Z1;
+    // If the feature has zero length, fall back to arithmetic mean of point vectors.
+    if (W1 < epsilon$2) x = X0, y = Y0, z = Z0;
+    m = x * x + y * y + z * z;
+    // If the feature still has an undefined ccentroid, then return.
+    if (m < epsilon2$1) return [NaN, NaN];
+  }
+
+  return [atan2(y, x) * degrees$1, asin(z / sqrt(m)) * degrees$1];
+};
+
+var constant$7 = function(x) {
+  return function() {
+    return x;
+  };
+};
+
+var compose = function(a, b) {
+
+  function compose(x, y) {
+    return x = a(x, y), b(x[0], x[1]);
+  }
+
+  if (a.invert && b.invert) compose.invert = function(x, y) {
+    return x = b.invert(x, y), x && a.invert(x[0], x[1]);
+  };
+
+  return compose;
+};
+
+function rotationIdentity(lambda, phi) {
+  return [lambda > pi$3 ? lambda - tau$3 : lambda < -pi$3 ? lambda + tau$3 : lambda, phi];
+}
+
+rotationIdentity.invert = rotationIdentity;
+
+function rotateRadians(deltaLambda, deltaPhi, deltaGamma) {
+  return (deltaLambda %= tau$3) ? (deltaPhi || deltaGamma ? compose(rotationLambda(deltaLambda), rotationPhiGamma(deltaPhi, deltaGamma))
+    : rotationLambda(deltaLambda))
+    : (deltaPhi || deltaGamma ? rotationPhiGamma(deltaPhi, deltaGamma)
+    : rotationIdentity);
+}
+
+function forwardRotationLambda(deltaLambda) {
+  return function(lambda, phi) {
+    return lambda += deltaLambda, [lambda > pi$3 ? lambda - tau$3 : lambda < -pi$3 ? lambda + tau$3 : lambda, phi];
+  };
+}
+
+function rotationLambda(deltaLambda) {
+  var rotation = forwardRotationLambda(deltaLambda);
+  rotation.invert = forwardRotationLambda(-deltaLambda);
+  return rotation;
+}
+
+function rotationPhiGamma(deltaPhi, deltaGamma) {
+  var cosDeltaPhi = cos$1(deltaPhi),
+      sinDeltaPhi = sin$1(deltaPhi),
+      cosDeltaGamma = cos$1(deltaGamma),
+      sinDeltaGamma = sin$1(deltaGamma);
+
+  function rotation(lambda, phi) {
+    var cosPhi = cos$1(phi),
+        x = cos$1(lambda) * cosPhi,
+        y = sin$1(lambda) * cosPhi,
+        z = sin$1(phi),
+        k = z * cosDeltaPhi + x * sinDeltaPhi;
+    return [
+      atan2(y * cosDeltaGamma - k * sinDeltaGamma, x * cosDeltaPhi - z * sinDeltaPhi),
+      asin(k * cosDeltaGamma + y * sinDeltaGamma)
+    ];
+  }
+
+  rotation.invert = function(lambda, phi) {
+    var cosPhi = cos$1(phi),
+        x = cos$1(lambda) * cosPhi,
+        y = sin$1(lambda) * cosPhi,
+        z = sin$1(phi),
+        k = z * cosDeltaGamma - y * sinDeltaGamma;
+    return [
+      atan2(y * cosDeltaGamma + z * sinDeltaGamma, x * cosDeltaPhi + k * sinDeltaPhi),
+      asin(k * cosDeltaPhi - x * sinDeltaPhi)
+    ];
+  };
+
+  return rotation;
+}
+
+var rotation = function(rotate) {
+  rotate = rotateRadians(rotate[0] * radians, rotate[1] * radians, rotate.length > 2 ? rotate[2] * radians : 0);
+
+  function forward(coordinates) {
+    coordinates = rotate(coordinates[0] * radians, coordinates[1] * radians);
+    return coordinates[0] *= degrees$1, coordinates[1] *= degrees$1, coordinates;
+  }
+
+  forward.invert = function(coordinates) {
+    coordinates = rotate.invert(coordinates[0] * radians, coordinates[1] * radians);
+    return coordinates[0] *= degrees$1, coordinates[1] *= degrees$1, coordinates;
+  };
+
+  return forward;
+};
+
+// Generates a circle centered at [0°, 0°], with a given radius and precision.
+function circleStream(stream, radius, delta, direction, t0, t1) {
+  if (!delta) return;
+  var cosRadius = cos$1(radius),
+      sinRadius = sin$1(radius),
+      step = direction * delta;
+  if (t0 == null) {
+    t0 = radius + direction * tau$3;
+    t1 = radius - step / 2;
+  } else {
+    t0 = circleRadius(cosRadius, t0);
+    t1 = circleRadius(cosRadius, t1);
+    if (direction > 0 ? t0 < t1 : t0 > t1) t0 += direction * tau$3;
+  }
+  for (var point, t = t0; direction > 0 ? t > t1 : t < t1; t -= step) {
+    point = spherical([cosRadius, -sinRadius * cos$1(t), -sinRadius * sin$1(t)]);
+    stream.point(point[0], point[1]);
+  }
+}
+
+// Returns the signed angle of a cartesian point relative to [cosRadius, 0, 0].
+function circleRadius(cosRadius, point) {
+  point = cartesian(point), point[0] -= cosRadius;
+  cartesianNormalizeInPlace(point);
+  var radius = acos(-point[1]);
+  return ((-point[2] < 0 ? -radius : radius) + tau$3 - epsilon$2) % tau$3;
+}
+
+var circle = function() {
+  var center = constant$7([0, 0]),
+      radius = constant$7(90),
+      precision = constant$7(6),
+      ring,
+      rotate,
+      stream = {point: point};
+
+  function point(x, y) {
+    ring.push(x = rotate(x, y));
+    x[0] *= degrees$1, x[1] *= degrees$1;
+  }
+
+  function circle() {
+    var c = center.apply(this, arguments),
+        r = radius.apply(this, arguments) * radians,
+        p = precision.apply(this, arguments) * radians;
+    ring = [];
+    rotate = rotateRadians(-c[0] * radians, -c[1] * radians, 0).invert;
+    circleStream(stream, r, p, 1);
+    c = {type: "Polygon", coordinates: [ring]};
+    ring = rotate = null;
+    return c;
+  }
+
+  circle.center = function(_) {
+    return arguments.length ? (center = typeof _ === "function" ? _ : constant$7([+_[0], +_[1]]), circle) : center;
+  };
+
+  circle.radius = function(_) {
+    return arguments.length ? (radius = typeof _ === "function" ? _ : constant$7(+_), circle) : radius;
+  };
+
+  circle.precision = function(_) {
+    return arguments.length ? (precision = typeof _ === "function" ? _ : constant$7(+_), circle) : precision;
+  };
+
+  return circle;
+};
+
+var clipBuffer = function() {
+  var lines = [],
+      line;
+  return {
+    point: function(x, y) {
+      line.push([x, y]);
     },
-    g: function(x, p) {
-      return x.toPrecision(p);
-    },
-    e: function(x, p) {
-      return x.toExponential(p);
-    },
-    f: function(x, p) {
-      return x.toFixed(p);
-    },
-    r: function(x, p) {
-      return (x = d3.round(x, d3_format_precision(x, p))).toFixed(Math.max(0, Math.min(20, d3_format_precision(x * (1 + 1e-15), p))));
-    }
-  });
-  function d3_format_typeDefault(x) {
-    return x + "";
-  }
-  var d3_time = d3.time = {}, d3_date = Date;
-  function d3_date_utc() {
-    this._ = new Date(arguments.length > 1 ? Date.UTC.apply(this, arguments) : arguments[0]);
-  }
-  d3_date_utc.prototype = {
-    getDate: function() {
-      return this._.getUTCDate();
+    lineStart: function() {
+      lines.push(line = []);
     },
-    getDay: function() {
-      return this._.getUTCDay();
-    },
-    getFullYear: function() {
-      return this._.getUTCFullYear();
-    },
-    getHours: function() {
-      return this._.getUTCHours();
-    },
-    getMilliseconds: function() {
-      return this._.getUTCMilliseconds();
-    },
-    getMinutes: function() {
-      return this._.getUTCMinutes();
-    },
-    getMonth: function() {
-      return this._.getUTCMonth();
-    },
-    getSeconds: function() {
-      return this._.getUTCSeconds();
-    },
-    getTime: function() {
-      return this._.getTime();
-    },
-    getTimezoneOffset: function() {
-      return 0;
+    lineEnd: noop$1,
+    rejoin: function() {
+      if (lines.length > 1) lines.push(lines.pop().concat(lines.shift()));
     },
-    valueOf: function() {
-      return this._.valueOf();
-    },
-    setDate: function() {
-      d3_time_prototype.setUTCDate.apply(this._, arguments);
-    },
-    setDay: function() {
-      d3_time_prototype.setUTCDay.apply(this._, arguments);
-    },
-    setFullYear: function() {
-      d3_time_prototype.setUTCFullYear.apply(this._, arguments);
-    },
-    setHours: function() {
-      d3_time_prototype.setUTCHours.apply(this._, arguments);
-    },
-    setMilliseconds: function() {
-      d3_time_prototype.setUTCMilliseconds.apply(this._, arguments);
-    },
-    setMinutes: function() {
-      d3_time_prototype.setUTCMinutes.apply(this._, arguments);
-    },
-    setMonth: function() {
-      d3_time_prototype.setUTCMonth.apply(this._, arguments);
-    },
-    setSeconds: function() {
-      d3_time_prototype.setUTCSeconds.apply(this._, arguments);
-    },
-    setTime: function() {
-      d3_time_prototype.setTime.apply(this._, arguments);
-    }
-  };
-  var d3_time_prototype = Date.prototype;
-  function d3_time_interval(local, step, number) {
-    function round(date) {
-      var d0 = local(date), d1 = offset(d0, 1);
-      return date - d0 < d1 - date ? d0 : d1;
-    }
-    function ceil(date) {
-      step(date = local(new d3_date(date - 1)), 1);
-      return date;
-    }
-    function offset(date, k) {
-      step(date = new d3_date(+date), k);
-      return date;
-    }
-    function range(t0, t1, dt) {
-      var time = ceil(t0), times = [];
-      if (dt > 1) {
-        while (time < t1) {
-          if (!(number(time) % dt)) times.push(new Date(+time));
-          step(time, 1);
+    result: function() {
+      var result = lines;
+      lines = [];
+      line = null;
+      return result;
+    }
+  };
+};
+
+var clipLine = function(a, b, x0, y0, x1, y1) {
+  var ax = a[0],
+      ay = a[1],
+      bx = b[0],
+      by = b[1],
+      t0 = 0,
+      t1 = 1,
+      dx = bx - ax,
+      dy = by - ay,
+      r;
+
+  r = x0 - ax;
+  if (!dx && r > 0) return;
+  r /= dx;
+  if (dx < 0) {
+    if (r < t0) return;
+    if (r < t1) t1 = r;
+  } else if (dx > 0) {
+    if (r > t1) return;
+    if (r > t0) t0 = r;
+  }
+
+  r = x1 - ax;
+  if (!dx && r < 0) return;
+  r /= dx;
+  if (dx < 0) {
+    if (r > t1) return;
+    if (r > t0) t0 = r;
+  } else if (dx > 0) {
+    if (r < t0) return;
+    if (r < t1) t1 = r;
+  }
+
+  r = y0 - ay;
+  if (!dy && r > 0) return;
+  r /= dy;
+  if (dy < 0) {
+    if (r < t0) return;
+    if (r < t1) t1 = r;
+  } else if (dy > 0) {
+    if (r > t1) return;
+    if (r > t0) t0 = r;
+  }
+
+  r = y1 - ay;
+  if (!dy && r < 0) return;
+  r /= dy;
+  if (dy < 0) {
+    if (r > t1) return;
+    if (r > t0) t0 = r;
+  } else if (dy > 0) {
+    if (r < t0) return;
+    if (r < t1) t1 = r;
+  }
+
+  if (t0 > 0) a[0] = ax + t0 * dx, a[1] = ay + t0 * dy;
+  if (t1 < 1) b[0] = ax + t1 * dx, b[1] = ay + t1 * dy;
+  return true;
+};
+
+var pointEqual = function(a, b) {
+  return abs(a[0] - b[0]) < epsilon$2 && abs(a[1] - b[1]) < epsilon$2;
+};
+
+function Intersection(point, points, other, entry) {
+  this.x = point;
+  this.z = points;
+  this.o = other; // another intersection
+  this.e = entry; // is an entry?
+  this.v = false; // visited
+  this.n = this.p = null; // next & previous
+}
+
+// A generalized polygon clipping algorithm: given a polygon that has been cut
+// into its visible line segments, and rejoins the segments by interpolating
+// along the clip edge.
+var clipPolygon = function(segments, compareIntersection, startInside, interpolate, stream) {
+  var subject = [],
+      clip = [],
+      i,
+      n;
+
+  segments.forEach(function(segment) {
+    if ((n = segment.length - 1) <= 0) return;
+    var n, p0 = segment[0], p1 = segment[n], x;
+
+    // If the first and last points of a segment are coincident, then treat as a
+    // closed ring. TODO if all rings are closed, then the winding order of the
+    // exterior ring should be checked.
+    if (pointEqual(p0, p1)) {
+      stream.lineStart();
+      for (i = 0; i < n; ++i) stream.point((p0 = segment[i])[0], p0[1]);
+      stream.lineEnd();
+      return;
+    }
+
+    subject.push(x = new Intersection(p0, segment, null, true));
+    clip.push(x.o = new Intersection(p0, null, x, false));
+    subject.push(x = new Intersection(p1, segment, null, false));
+    clip.push(x.o = new Intersection(p1, null, x, true));
+  });
+
+  if (!subject.length) return;
+
+  clip.sort(compareIntersection);
+  link$1(subject);
+  link$1(clip);
+
+  for (i = 0, n = clip.length; i < n; ++i) {
+    clip[i].e = startInside = !startInside;
+  }
+
+  var start = subject[0],
+      points,
+      point;
+
+  while (1) {
+    // Find first unvisited intersection.
+    var current = start,
+        isSubject = true;
+    while (current.v) if ((current = current.n) === start) return;
+    points = current.z;
+    stream.lineStart();
+    do {
+      current.v = current.o.v = true;
+      if (current.e) {
+        if (isSubject) {
+          for (i = 0, n = points.length; i < n; ++i) stream.point((point = points[i])[0], point[1]);
+        } else {
+          interpolate(current.x, current.n.x, 1, stream);
+        }
+        current = current.n;
+      } else {
+        if (isSubject) {
+          points = current.p.z;
+          for (i = points.length - 1; i >= 0; --i) stream.point((point = points[i])[0], point[1]);
+        } else {
+          interpolate(current.x, current.p.x, -1, stream);
+        }
+        current = current.p;
+      }
+      current = current.o;
+      points = current.z;
+      isSubject = !isSubject;
+    } while (!current.v);
+    stream.lineEnd();
+  }
+};
+
+function link$1(array) {
+  if (!(n = array.length)) return;
+  var n,
+      i = 0,
+      a = array[0],
+      b;
+  while (++i < n) {
+    a.n = b = array[i];
+    b.p = a;
+    a = b;
+  }
+  a.n = b = array[0];
+  b.p = a;
+}
+
+var clipMax = 1e9;
+var clipMin = -clipMax;
+
+// TODO Use d3-polygon’s polygonContains here for the ring check?
+// TODO Eliminate duplicate buffering in clipBuffer and polygon.push?
+
+function clipExtent(x0, y0, x1, y1) {
+
+  function visible(x, y) {
+    return x0 <= x && x <= x1 && y0 <= y && y <= y1;
+  }
+
+  function interpolate(from, to, direction, stream) {
+    var a = 0, a1 = 0;
+    if (from == null
+        || (a = corner(from, direction)) !== (a1 = corner(to, direction))
+        || comparePoint(from, to) < 0 ^ direction > 0) {
+      do stream.point(a === 0 || a === 3 ? x0 : x1, a > 1 ? y1 : y0);
+      while ((a = (a + direction + 4) % 4) !== a1);
+    } else {
+      stream.point(to[0], to[1]);
+    }
+  }
+
+  function corner(p, direction) {
+    return abs(p[0] - x0) < epsilon$2 ? direction > 0 ? 0 : 3
+        : abs(p[0] - x1) < epsilon$2 ? direction > 0 ? 2 : 1
+        : abs(p[1] - y0) < epsilon$2 ? direction > 0 ? 1 : 0
+        : direction > 0 ? 3 : 2; // abs(p[1] - y1) < epsilon
+  }
+
+  function compareIntersection(a, b) {
+    return comparePoint(a.x, b.x);
+  }
+
+  function comparePoint(a, b) {
+    var ca = corner(a, 1),
+        cb = corner(b, 1);
+    return ca !== cb ? ca - cb
+        : ca === 0 ? b[1] - a[1]
+        : ca === 1 ? a[0] - b[0]
+        : ca === 2 ? a[1] - b[1]
+        : b[0] - a[0];
+  }
+
+  return function(stream) {
+    var activeStream = stream,
+        bufferStream = clipBuffer(),
+        segments,
+        polygon,
+        ring,
+        x__, y__, v__, // first point
+        x_, y_, v_, // previous point
+        first,
+        clean;
+
+    var clipStream = {
+      point: point,
+      lineStart: lineStart,
+      lineEnd: lineEnd,
+      polygonStart: polygonStart,
+      polygonEnd: polygonEnd
+    };
+
+    function point(x, y) {
+      if (visible(x, y)) activeStream.point(x, y);
+    }
+
+    function polygonInside() {
+      var winding = 0;
+
+      for (var i = 0, n = polygon.length; i < n; ++i) {
+        for (var ring = polygon[i], j = 1, m = ring.length, point = ring[0], a0, a1, b0 = point[0], b1 = point[1]; j < m; ++j) {
+          a0 = b0, a1 = b1, point = ring[j], b0 = point[0], b1 = point[1];
+          if (a1 <= y1) { if (b1 > y1 && (b0 - a0) * (y1 - a1) > (b1 - a1) * (x0 - a0)) ++winding; }
+          else { if (b1 <= y1 && (b0 - a0) * (y1 - a1) < (b1 - a1) * (x0 - a0)) --winding; }
+        }
+      }
+
+      return winding;
+    }
+
+    // Buffer geometry within a polygon and then clip it en masse.
+    function polygonStart() {
+      activeStream = bufferStream, segments = [], polygon = [], clean = true;
+    }
+
+    function polygonEnd() {
+      var startInside = polygonInside(),
+          cleanInside = clean && startInside,
+          visible = (segments = merge(segments)).length;
+      if (cleanInside || visible) {
+        stream.polygonStart();
+        if (cleanInside) {
+          stream.lineStart();
+          interpolate(null, null, 1, stream);
+          stream.lineEnd();
+        }
+        if (visible) {
+          clipPolygon(segments, compareIntersection, startInside, interpolate, stream);
+        }
+        stream.polygonEnd();
+      }
+      activeStream = stream, segments = polygon = ring = null;
+    }
+
+    function lineStart() {
+      clipStream.point = linePoint;
+      if (polygon) polygon.push(ring = []);
+      first = true;
+      v_ = false;
+      x_ = y_ = NaN;
+    }
+
+    // TODO rather than special-case polygons, simply handle them separately.
+    // Ideally, coincident intersection points should be jittered to avoid
+    // clipping issues.
+    function lineEnd() {
+      if (segments) {
+        linePoint(x__, y__);
+        if (v__ && v_) bufferStream.rejoin();
+        segments.push(bufferStream.result());
+      }
+      clipStream.point = point;
+      if (v_) activeStream.lineEnd();
+    }
+
+    function linePoint(x, y) {
+      var v = visible(x, y);
+      if (polygon) ring.push([x, y]);
+      if (first) {
+        x__ = x, y__ = y, v__ = v;
+        first = false;
+        if (v) {
+          activeStream.lineStart();
+          activeStream.point(x, y);
         }
       } else {
-        while (time < t1) times.push(new Date(+time)), step(time, 1);
-      }
-      return times;
-    }
-    function range_utc(t0, t1, dt) {
-      try {
-        d3_date = d3_date_utc;
-        var utc = new d3_date_utc();
-        utc._ = t0;
-        return range(utc, t1, dt);
-      } finally {
-        d3_date = Date;
-      }
-    }
-    local.floor = local;
-    local.round = round;
-    local.ceil = ceil;
-    local.offset = offset;
-    local.range = range;
-    var utc = local.utc = d3_time_interval_utc(local);
-    utc.floor = utc;
-    utc.round = d3_time_interval_utc(round);
-    utc.ceil = d3_time_interval_utc(ceil);
-    utc.offset = d3_time_interval_utc(offset);
-    utc.range = range_utc;
-    return local;
-  }
-  function d3_time_interval_utc(method) {
-    return function(date, k) {
-      try {
-        d3_date = d3_date_utc;
-        var utc = new d3_date_utc();
-        utc._ = date;
-        return method(utc, k)._;
-      } finally {
-        d3_date = Date;
-      }
-    };
-  }
-  d3_time.year = d3_time_interval(function(date) {
-    date = d3_time.day(date);
-    date.setMonth(0, 1);
-    return date;
-  }, function(date, offset) {
-    date.setFullYear(date.getFullYear() + offset);
-  }, function(date) {
-    return date.getFullYear();
-  });
-  d3_time.years = d3_time.year.range;
-  d3_time.years.utc = d3_time.year.utc.range;
-  d3_time.day = d3_time_interval(function(date) {
-    var day = new d3_date(2e3, 0);
-    day.setFullYear(date.getFullYear(), date.getMonth(), date.getDate());
-    return day;
-  }, function(date, offset) {
-    date.setDate(date.getDate() + offset);
-  }, function(date) {
-    return date.getDate() - 1;
-  });
-  d3_time.days = d3_time.day.range;
-  d3_time.days.utc = d3_time.day.utc.range;
-  d3_time.dayOfYear = function(date) {
-    var year = d3_time.year(date);
-    return Math.floor((date - year - (date.getTimezoneOffset() - year.getTimezoneOffset()) * 6e4) / 864e5);
-  };
-  [ "sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday" ].forEach(function(day, i) {
-    i = 7 - i;
-    var interval = d3_time[day] = d3_time_interval(function(date) {
-      (date = d3_time.day(date)).setDate(date.getDate() - (date.getDay() + i) % 7);
-      return date;
-    }, function(date, offset) {
-      date.setDate(date.getDate() + Math.floor(offset) * 7);
-    }, function(date) {
-      var day = d3_time.year(date).getDay();
-      return Math.floor((d3_time.dayOfYear(date) + (day + i) % 7) / 7) - (day !== i);
-    });
-    d3_time[day + "s"] = interval.range;
-    d3_time[day + "s"].utc = interval.utc.range;
-    d3_time[day + "OfYear"] = function(date) {
-      var day = d3_time.year(date).getDay();
-      return Math.floor((d3_time.dayOfYear(date) + (day + i) % 7) / 7);
-    };
-  });
-  d3_time.week = d3_time.sunday;
-  d3_time.weeks = d3_time.sunday.range;
-  d3_time.weeks.utc = d3_time.sunday.utc.range;
-  d3_time.weekOfYear = d3_time.sundayOfYear;
-  function d3_locale_timeFormat(locale) {
-    var locale_dateTime = locale.dateTime, locale_date = locale.date, locale_time = locale.time, locale_periods = locale.periods, locale_days = locale.days, locale_shortDays = locale.shortDays, locale_months = locale.months, locale_shortMonths = locale.shortMonths;
-    function d3_time_format(template) {
-      var n = template.length;
-      function format(date) {
-        var string = [], i = -1, j = 0, c, p, f;
-        while (++i < n) {
-          if (template.charCodeAt(i) === 37) {
-            string.push(template.substring(j, i));
-            if ((p = d3_time_formatPads[c = template.charAt(++i)]) != null) c = template.charAt(++i);
-            if (f = d3_time_formats[c]) c = f(date, p == null ? c === "e" ? " " : "0" : p);
-            string.push(c);
-            j = i + 1;
+        if (v && v_) activeStream.point(x, y);
+        else {
+          var a = [x_ = Math.max(clipMin, Math.min(clipMax, x_)), y_ = Math.max(clipMin, Math.min(clipMax, y_))],
+              b = [x = Math.max(clipMin, Math.min(clipMax, x)), y = Math.max(clipMin, Math.min(clipMax, y))];
+          if (clipLine(a, b, x0, y0, x1, y1)) {
+            if (!v_) {
+              activeStream.lineStart();
+              activeStream.point(a[0], a[1]);
+            }
+            activeStream.point(b[0], b[1]);
+            if (!v) activeStream.lineEnd();
+            clean = false;
+          } else if (v) {
+            activeStream.lineStart();
+            activeStream.point(x, y);
+            clean = false;
           }
         }
-        string.push(template.substring(j, i));
-        return string.join("");
-      }
-      format.parse = function(string) {
-        var d = {
-          y: 1900,
-          m: 0,
-          d: 1,
-          H: 0,
-          M: 0,
-          S: 0,
-          L: 0,
-          Z: null
-        }, i = d3_time_parse(d, template, string, 0);
-        if (i != string.length) return null;
-        if ("p" in d) d.H = d.H % 12 + d.p * 12;
-        var localZ = d.Z != null && d3_date !== d3_date_utc, date = new (localZ ? d3_date_utc : d3_date)();
-        if ("j" in d) date.setFullYear(d.y, 0, d.j); else if ("w" in d && ("W" in d || "U" in d)) {
-          date.setFullYear(d.y, 0, 1);
-          date.setFullYear(d.y, 0, "W" in d ? (d.w + 6) % 7 + d.W * 7 - (date.getDay() + 5) % 7 : d.w + d.U * 7 - (date.getDay() + 6) % 7);
-        } else date.setFullYear(d.y, d.m, d.d);
-        date.setHours(d.H + Math.floor(d.Z / 100), d.M + d.Z % 100, d.S, d.L);
-        return localZ ? date._ : date;
-      };
-      format.toString = function() {
-        return template;
-      };
-      return format;
-    }
-    function d3_time_parse(date, template, string, j) {
-      var c, p, t, i = 0, n = template.length, m = string.length;
-      while (i < n) {
-        if (j >= m) return -1;
-        c = template.charCodeAt(i++);
-        if (c === 37) {
-          t = template.charAt(i++);
-          p = d3_time_parsers[t in d3_time_formatPads ? template.charAt(i++) : t];
-          if (!p || (j = p(date, string, j)) < 0) return -1;
-        } else if (c != string.charCodeAt(j++)) {
-          return -1;
-        }
-      }
-      return j;
-    }
-    d3_time_format.utc = function(template) {
-      var local = d3_time_format(template);
-      function format(date) {
-        try {
-          d3_date = d3_date_utc;
-          var utc = new d3_date();
-          utc._ = date;
-          return local(utc);
-        } finally {
-          d3_date = Date;
-        }
-      }
-      format.parse = function(string) {
-        try {
-          d3_date = d3_date_utc;
-          var date = local.parse(string);
-          return date && date._;
-        } finally {
-          d3_date = Date;
-        }
-      };
-      format.toString = local.toString;
-      return format;
-    };
-    d3_time_format.multi = d3_time_format.utc.multi = d3_time_formatMulti;
-    var d3_time_periodLookup = d3.map(), d3_time_dayRe = d3_time_formatRe(locale_days), d3_time_dayLookup = d3_time_formatLookup(locale_days), d3_time_dayAbbrevRe = d3_time_formatRe(locale_shortDays), d3_time_dayAbbrevLookup = d3_time_formatLookup(locale_shortDays), d3_time_monthRe = d3_time_formatRe(locale_months), d3_time_monthLookup = d3_time_formatLookup(locale_months), d3_time_monthAbbrevRe = d3_time_formatRe(locale_shortMonths), d3_time_monthAbbrevLookup = d3_time_formatLookup(locale_shortMonths);
-    locale_periods.forEach(function(p, i) {
-      d3_time_periodLookup.set(p.toLowerCase(), i);
-    });
-    var d3_time_formats = {
-      a: function(d) {
-        return locale_shortDays[d.getDay()];
-      },
-      A: function(d) {
-        return locale_days[d.getDay()];
-      },
-      b: function(d) {
-        return locale_shortMonths[d.getMonth()];
-      },
-      B: function(d) {
-        return locale_months[d.getMonth()];
-      },
-      c: d3_time_format(locale_dateTime),
-      d: function(d, p) {
-        return d3_time_formatPad(d.getDate(), p, 2);
-      },
-      e: function(d, p) {
-        return d3_time_formatPad(d.getDate(), p, 2);
-      },
-      H: function(d, p) {
-        return d3_time_formatPad(d.getHours(), p, 2);
-      },
-      I: function(d, p) {
-        return d3_time_formatPad(d.getHours() % 12 || 12, p, 2);
-      },
-      j: function(d, p) {
-        return d3_time_formatPad(1 + d3_time.dayOfYear(d), p, 3);
-      },
-      L: function(d, p) {
-        return d3_time_formatPad(d.getMilliseconds(), p, 3);
-      },
-      m: function(d, p) {
-        return d3_time_formatPad(d.getMonth() + 1, p, 2);
-      },
-      M: function(d, p) {
-        return d3_time_formatPad(d.getMinutes(), p, 2);
-      },
-      p: function(d) {
-        return locale_periods[+(d.getHours() >= 12)];
-      },
-      S: function(d, p) {
-        return d3_time_formatPad(d.getSeconds(), p, 2);
-      },
-      U: function(d, p) {
-        return d3_time_formatPad(d3_time.sundayOfYear(d), p, 2);
-      },
-      w: function(d) {
-        return d.getDay();
-      },
-      W: function(d, p) {
-        return d3_time_formatPad(d3_time.mondayOfYear(d), p, 2);
-      },
-      x: d3_time_format(locale_date),
-      X: d3_time_format(locale_time),
-      y: function(d, p) {
-        return d3_time_formatPad(d.getFullYear() % 100, p, 2);
-      },
-      Y: function(d, p) {
-        return d3_time_formatPad(d.getFullYear() % 1e4, p, 4);
-      },
-      Z: d3_time_zone,
-      "%": function() {
-        return "%";
-      }
-    };
-    var d3_time_parsers = {
-      a: d3_time_parseWeekdayAbbrev,
-      A: d3_time_parseWeekday,
-      b: d3_time_parseMonthAbbrev,
-      B: d3_time_parseMonth,
-      c: d3_time_parseLocaleFull,
-      d: d3_time_parseDay,
-      e: d3_time_parseDay,
-      H: d3_time_parseHour24,
-      I: d3_time_parseHour24,
-      j: d3_time_parseDayOfYear,
-      L: d3_time_parseMilliseconds,
-      m: d3_time_parseMonthNumber,
-      M: d3_time_parseMinutes,
-      p: d3_time_parseAmPm,
-      S: d3_time_parseSeconds,
-      U: d3_time_parseWeekNumberSunday,
-      w: d3_time_parseWeekdayNumber,
-      W: d3_time_parseWeekNumberMonday,
-      x: d3_time_parseLocaleDate,
-      X: d3_time_parseLocaleTime,
-      y: d3_time_parseYear,
-      Y: d3_time_parseFullYear,
-      Z: d3_time_parseZone,
-      "%": d3_time_parseLiteralPercent
+      }
+      x_ = x, y_ = y, v_ = v;
+    }
+
+    return clipStream;
+  };
+}
+
+var extent$1 = function() {
+  var x0 = 0,
+      y0 = 0,
+      x1 = 960,
+      y1 = 500,
+      cache,
+      cacheStream,
+      clip;
+
+  return clip = {
+    stream: function(stream) {
+      return cache && cacheStream === stream ? cache : cache = clipExtent(x0, y0, x1, y1)(cacheStream = stream);
+    },
+    extent: function(_) {
+      return arguments.length ? (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1], cache = cacheStream = null, clip) : [[x0, y0], [x1, y1]];
+    }
+  };
+};
+
+var sum$1 = adder();
+
+var polygonContains = function(polygon, point) {
+  var lambda = point[0],
+      phi = point[1],
+      normal = [sin$1(lambda), -cos$1(lambda), 0],
+      angle = 0,
+      winding = 0;
+
+  sum$1.reset();
+
+  for (var i = 0, n = polygon.length; i < n; ++i) {
+    if (!(m = (ring = polygon[i]).length)) continue;
+    var ring,
+        m,
+        point0 = ring[m - 1],
+        lambda0 = point0[0],
+        phi0 = point0[1] / 2 + quarterPi,
+        sinPhi0 = sin$1(phi0),
+        cosPhi0 = cos$1(phi0);
+
+    for (var j = 0; j < m; ++j, lambda0 = lambda1, sinPhi0 = sinPhi1, cosPhi0 = cosPhi1, point0 = point1) {
+      var point1 = ring[j],
+          lambda1 = point1[0],
+          phi1 = point1[1] / 2 + quarterPi,
+          sinPhi1 = sin$1(phi1),
+          cosPhi1 = cos$1(phi1),
+          delta = lambda1 - lambda0,
+          sign$$1 = delta >= 0 ? 1 : -1,
+          absDelta = sign$$1 * delta,
+          antimeridian = absDelta > pi$3,
+          k = sinPhi0 * sinPhi1;
+
+      sum$1.add(atan2(k * sign$$1 * sin$1(absDelta), cosPhi0 * cosPhi1 + k * cos$1(absDelta)));
+      angle += antimeridian ? delta + sign$$1 * tau$3 : delta;
+
+      // Are the longitudes either side of the point’s meridian (lambda),
+      // and are the latitudes smaller than the parallel (phi)?
+      if (antimeridian ^ lambda0 >= lambda ^ lambda1 >= lambda) {
+        var arc = cartesianCross(cartesian(point0), cartesian(point1));
+        cartesianNormalizeInPlace(arc);
+        var intersection = cartesianCross(normal, arc);
+        cartesianNormalizeInPlace(intersection);
+        var phiArc = (antimeridian ^ delta >= 0 ? -1 : 1) * asin(intersection[2]);
+        if (phi > phiArc || phi === phiArc && (arc[0] || arc[1])) {
+          winding += antimeridian ^ delta >= 0 ? 1 : -1;
+        }
+      }
+    }
+  }
+
+  // First, determine whether the South pole is inside or outside:
+  //
+  // It is inside if:
+  // * the polygon winds around it in a clockwise direction.
+  // * the polygon does not (cumulatively) wind around it, but has a negative
+  //   (counter-clockwise) area.
+  //
+  // Second, count the (signed) number of times a segment crosses a lambda
+  // from the point to the South pole.  If it is zero, then the point is the
+  // same side as the South pole.
+
+  return (angle < -epsilon$2 || angle < epsilon$2 && sum$1 < -epsilon$2) ^ (winding & 1);
+};
+
+var lengthSum = adder();
+var lambda0$2;
+var sinPhi0$1;
+var cosPhi0$1;
+
+var lengthStream = {
+  sphere: noop$1,
+  point: noop$1,
+  lineStart: lengthLineStart,
+  lineEnd: noop$1,
+  polygonStart: noop$1,
+  polygonEnd: noop$1
+};
+
+function lengthLineStart() {
+  lengthStream.point = lengthPointFirst;
+  lengthStream.lineEnd = lengthLineEnd;
+}
+
+function lengthLineEnd() {
+  lengthStream.point = lengthStream.lineEnd = noop$1;
+}
+
+function lengthPointFirst(lambda, phi) {
+  lambda *= radians, phi *= radians;
+  lambda0$2 = lambda, sinPhi0$1 = sin$1(phi), cosPhi0$1 = cos$1(phi);
+  lengthStream.point = lengthPoint;
+}
+
+function lengthPoint(lambda, phi) {
+  lambda *= radians, phi *= radians;
+  var sinPhi = sin$1(phi),
+      cosPhi = cos$1(phi),
+      delta = abs(lambda - lambda0$2),
+      cosDelta = cos$1(delta),
+      sinDelta = sin$1(delta),
+      x = cosPhi * sinDelta,
+      y = cosPhi0$1 * sinPhi - sinPhi0$1 * cosPhi * cosDelta,
+      z = sinPhi0$1 * sinPhi + cosPhi0$1 * cosPhi * cosDelta;
+  lengthSum.add(atan2(sqrt(x * x + y * y), z));
+  lambda0$2 = lambda, sinPhi0$1 = sinPhi, cosPhi0$1 = cosPhi;
+}
+
+var length$1 = function(object) {
+  lengthSum.reset();
+  geoStream(object, lengthStream);
+  return +lengthSum;
+};
+
+var coordinates = [null, null];
+var object$1 = {type: "LineString", coordinates: coordinates};
+
+var distance = function(a, b) {
+  coordinates[0] = a;
+  coordinates[1] = b;
+  return length$1(object$1);
+};
+
+var containsObjectType = {
+  Feature: function(object, point) {
+    return containsGeometry(object.geometry, point);
+  },
+  FeatureCollection: function(object, point) {
+    var features = object.features, i = -1, n = features.length;
+    while (++i < n) if (containsGeometry(features[i].geometry, point)) return true;
+    return false;
+  }
+};
+
+var containsGeometryType = {
+  Sphere: function() {
+    return true;
+  },
+  Point: function(object, point) {
+    return containsPoint(object.coordinates, point);
+  },
+  MultiPoint: function(object, point) {
+    var coordinates = object.coordinates, i = -1, n = coordinates.length;
+    while (++i < n) if (containsPoint(coordinates[i], point)) return true;
+    return false;
+  },
+  LineString: function(object, point) {
+    return containsLine(object.coordinates, point);
+  },
+  MultiLineString: function(object, point) {
+    var coordinates = object.coordinates, i = -1, n = coordinates.length;
+    while (++i < n) if (containsLine(coordinates[i], point)) return true;
+    return false;
+  },
+  Polygon: function(object, point) {
+    return containsPolygon(object.coordinates, point);
+  },
+  MultiPolygon: function(object, point) {
+    var coordinates = object.coordinates, i = -1, n = coordinates.length;
+    while (++i < n) if (containsPolygon(coordinates[i], point)) return true;
+    return false;
+  },
+  GeometryCollection: function(object, point) {
+    var geometries = object.geometries, i = -1, n = geometries.length;
+    while (++i < n) if (containsGeometry(geometries[i], point)) return true;
+    return false;
+  }
+};
+
+function containsGeometry(geometry, point) {
+  return geometry && containsGeometryType.hasOwnProperty(geometry.type)
+      ? containsGeometryType[geometry.type](geometry, point)
+      : false;
+}
+
+function containsPoint(coordinates, point) {
+  return distance(coordinates, point) === 0;
+}
+
+function containsLine(coordinates, point) {
+  var ab = distance(coordinates[0], coordinates[1]),
+      ao = distance(coordinates[0], point),
+      ob = distance(point, coordinates[1]);
+  return ao + ob <= ab + epsilon$2;
+}
+
+function containsPolygon(coordinates, point) {
+  return !!polygonContains(coordinates.map(ringRadians), pointRadians(point));
+}
+
+function ringRadians(ring) {
+  return ring = ring.map(pointRadians), ring.pop(), ring;
+}
+
+function pointRadians(point) {
+  return [point[0] * radians, point[1] * radians];
+}
+
+var contains = function(object, point) {
+  return (object && containsObjectType.hasOwnProperty(object.type)
+      ? containsObjectType[object.type]
+      : containsGeometry)(object, point);
+};
+
+function graticuleX(y0, y1, dy) {
+  var y = sequence(y0, y1 - epsilon$2, dy).concat(y1);
+  return function(x) { return y.map(function(y) { return [x, y]; }); };
+}
+
+function graticuleY(x0, x1, dx) {
+  var x = sequence(x0, x1 - epsilon$2, dx).concat(x1);
+  return function(y) { return x.map(function(x) { return [x, y]; }); };
+}
+
+function graticule() {
+  var x1, x0, X1, X0,
+      y1, y0, Y1, Y0,
+      dx = 10, dy = dx, DX = 90, DY = 360,
+      x, y, X, Y,
+      precision = 2.5;
+
+  function graticule() {
+    return {type: "MultiLineString", coordinates: lines()};
+  }
+
+  function lines() {
+    return sequence(ceil(X0 / DX) * DX, X1, DX).map(X)
+        .concat(sequence(ceil(Y0 / DY) * DY, Y1, DY).map(Y))
+        .concat(sequence(ceil(x0 / dx) * dx, x1, dx).filter(function(x) { return abs(x % DX) > epsilon$2; }).map(x))
+        .concat(sequence(ceil(y0 / dy) * dy, y1, dy).filter(function(y) { return abs(y % DY) > epsilon$2; }).map(y));
+  }
+
+  graticule.lines = function() {
+    return lines().map(function(coordinates) { return {type: "LineString", coordinates: coordinates}; });
+  };
+
+  graticule.outline = function() {
+    return {
+      type: "Polygon",
+      coordinates: [
+        X(X0).concat(
+        Y(Y1).slice(1),
+        X(X1).reverse().slice(1),
+        Y(Y0).reverse().slice(1))
+      ]
     };
-    function d3_time_parseWeekdayAbbrev(date, string, i) {
-      d3_time_dayAbbrevRe.lastIndex = 0;
-      var n = d3_time_dayAbbrevRe.exec(string.substring(i));
-      return n ? (date.w = d3_time_dayAbbrevLookup.get(n[0].toLowerCase()), i + n[0].length) : -1;
-    }
-    function d3_time_parseWeekday(date, string, i) {
-      d3_time_dayRe.lastIndex = 0;
-      var n = d3_time_dayRe.exec(string.substring(i));
-      return n ? (date.w = d3_time_dayLookup.get(n[0].toLowerCase()), i + n[0].length) : -1;
-    }
-    function d3_time_parseMonthAbbrev(date, string, i) {
-      d3_time_monthAbbrevRe.lastIndex = 0;
-      var n = d3_time_monthAbbrevRe.exec(string.substring(i));
-      return n ? (date.m = d3_time_monthAbbrevLookup.get(n[0].toLowerCase()), i + n[0].length) : -1;
-    }
-    function d3_time_parseMonth(date, string, i) {
-      d3_time_monthRe.lastIndex = 0;
-      var n = d3_time_monthRe.exec(string.substring(i));
-      return n ? (date.m = d3_time_monthLookup.get(n[0].toLowerCase()), i + n[0].length) : -1;
-    }
-    function d3_time_parseLocaleFull(date, string, i) {
-      return d3_time_parse(date, d3_time_formats.c.toString(), string, i);
-    }
-    function d3_time_parseLocaleDate(date, string, i) {
-      return d3_time_parse(date, d3_time_formats.x.toString(), string, i);
-    }
-    function d3_time_parseLocaleTime(date, string, i) {
-      return d3_time_parse(date, d3_time_formats.X.toString(), string, i);
-    }
-    function d3_time_parseAmPm(date, string, i) {
-      var n = d3_time_periodLookup.get(string.substring(i, i += 2).toLowerCase());
-      return n == null ? -1 : (date.p = n, i);
-    }
-    return d3_time_format;
-  }
-  var d3_time_formatPads = {
-    "-": "",
-    _: " ",
-    "0": "0"
-  }, d3_time_numberRe = /^\s*\d+/, d3_time_percentRe = /^%/;
-  function d3_time_formatPad(value, fill, width) {
-    var sign = value < 0 ? "-" : "", string = (sign ? -value : value) + "", length = string.length;
-    return sign + (length < width ? new Array(width - length + 1).join(fill) + string : string);
-  }
-  function d3_time_formatRe(names) {
-    return new RegExp("^(?:" + names.map(d3.requote).join("|") + ")", "i");
-  }
-  function d3_time_formatLookup(names) {
-    var map = new d3_Map(), i = -1, n = names.length;
-    while (++i < n) map.set(names[i].toLowerCase(), i);
-    return map;
-  }
-  function d3_time_parseWeekdayNumber(date, string, i) {
-    d3_time_numberRe.lastIndex = 0;
-    var n = d3_time_numberRe.exec(string.substring(i, i + 1));
-    return n ? (date.w = +n[0], i + n[0].length) : -1;
-  }
-  function d3_time_parseWeekNumberSunday(date, string, i) {
-    d3_time_numberRe.lastIndex = 0;
-    var n = d3_time_numberRe.exec(string.substring(i));
-    return n ? (date.U = +n[0], i + n[0].length) : -1;
-  }
-  function d3_time_parseWeekNumberMonday(date, string, i) {
-    d3_time_numberRe.lastIndex = 0;
-    var n = d3_time_numberRe.exec(string.substring(i));
-    return n ? (date.W = +n[0], i + n[0].length) : -1;
-  }
-  function d3_time_parseFullYear(date, string, i) {
-    d3_time_numberRe.lastIndex = 0;
-    var n = d3_time_numberRe.exec(string.substring(i, i + 4));
-    return n ? (date.y = +n[0], i + n[0].length) : -1;
-  }
-  function d3_time_parseYear(date, string, i) {
-    d3_time_numberRe.lastIndex = 0;
-    var n = d3_time_numberRe.exec(string.substring(i, i + 2));
-    return n ? (date.y = d3_time_expandYear(+n[0]), i + n[0].length) : -1;
-  }
-  function d3_time_parseZone(date, string, i) {
-    return /^[+-]\d{4}$/.test(string = string.substring(i, i + 5)) ? (date.Z = -string, 
-    i + 5) : -1;
-  }
-  function d3_time_expandYear(d) {
-    return d + (d > 68 ? 1900 : 2e3);
-  }
-  function d3_time_parseMonthNumber(date, string, i) {
-    d3_time_numberRe.lastIndex = 0;
-    var n = d3_time_numberRe.exec(string.substring(i, i + 2));
-    return n ? (date.m = n[0] - 1, i + n[0].length) : -1;
-  }
-  function d3_time_parseDay(date, string, i) {
-    d3_time_numberRe.lastIndex = 0;
-    var n = d3_time_numberRe.exec(string.substring(i, i + 2));
-    return n ? (date.d = +n[0], i + n[0].length) : -1;
-  }
-  function d3_time_parseDayOfYear(date, string, i) {
-    d3_time_numberRe.lastIndex = 0;
-    var n = d3_time_numberRe.exec(string.substring(i, i + 3));
-    return n ? (date.j = +n[0], i + n[0].length) : -1;
-  }
-  function d3_time_parseHour24(date, string, i) {
-    d3_time_numberRe.lastIndex = 0;
-    var n = d3_time_numberRe.exec(string.substring(i, i + 2));
-    return n ? (date.H = +n[0], i + n[0].length) : -1;
-  }
-  function d3_time_parseMinutes(date, string, i) {
-    d3_time_numberRe.lastIndex = 0;
-    var n = d3_time_numberRe.exec(string.substring(i, i + 2));
-    return n ? (date.M = +n[0], i + n[0].length) : -1;
-  }
-  function d3_time_parseSeconds(date, string, i) {
-    d3_time_numberRe.lastIndex = 0;
-    var n = d3_time_numberRe.exec(string.substring(i, i + 2));
-    return n ? (date.S = +n[0], i + n[0].length) : -1;
-  }
-  function d3_time_parseMilliseconds(date, string, i) {
-    d3_time_numberRe.lastIndex = 0;
-    var n = d3_time_numberRe.exec(string.substring(i, i + 3));
-    return n ? (date.L = +n[0], i + n[0].length) : -1;
-  }
-  function d3_time_zone(d) {
-    var z = d.getTimezoneOffset(), zs = z > 0 ? "-" : "+", zh = ~~(abs(z) / 60), zm = abs(z) % 60;
-    return zs + d3_time_formatPad(zh, "0", 2) + d3_time_formatPad(zm, "0", 2);
-  }
-  function d3_time_parseLiteralPercent(date, string, i) {
-    d3_time_percentRe.lastIndex = 0;