// Appends the chart to an 'svg' element.
  var chart = d3.select('body')
    .append('svg')
    .height(350)
    .width(400)
    .chart('Pie', {
      height: 350,
      width: 400,
      radius: 100,
      donutHole: {
        radius: 80
      }
      labelTemplate: '[{label}]' // [my label]
    });

  // Draws graph once you add data.
  chart.draw([
    {
      label: 'my label',
      value: 3
    }, {
      label: 'your label',
      value: 0.5
    }, {
      label: 'other label',
      value: 1
    }
  ]);

  {
    radius: 100,
    width: 450, // Or container's width
    height: 300, // Or container's height
    labelTemplate: '{label}',
    labels: undefined,
    legend: undefined
    donutHole: undefined
  }

{
  radius: int|float,
  color: valid d3 colors
}