--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/core/formatPrefix.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,20 @@
+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 <= 0 ? i + 1 : i - 1) / 3) * 3));
+  }
+  return d3_formatPrefixes[8 + i / 3];
+};
+
+function d3_formatPrefix(d, i) {
+  return {
+    scale: Math.pow(10, (8 - i) * 3),
+    symbol: d
+  };
+}
+