series.neckRatio Number (default: 0.3)

neckRatio specifies the ratio top-base/bottom-base of the whole chart. neckRatio set to three means the top base is three times smaller than the bottom base.

The neckRatio option is supported when series.type is set to "funnel" and dynamicSlope set to false.

Example - set the chart series neckRatio field

<div id="chart"></div>
  series: [
      type: "funnel",
      neckRatio: 0.1, //bottom base becomes 10 times smaller than the bottom one
      data: [
        { value: 1 },
        { value: 2 },
        { value: 3 }
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