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

  };

}