xAxis.minorUnit Number

The interval between minor divisions. It defaults to 1/5 of the xAxis.majorUnit. If the xAxis.type is set to "log", the minorUnit value represents the number of divisions between two major units and defaults to the major unit minus one.

Example - set the logarithmic x axis minor unit

<div id="chart"></div>
  xAxis: {
    type: "log",
    minorUnit: 2,
    minorGridLines: {
      visible: true
  series: [{
      type: "scatter",
      data: [[3, 1],[20, 2]]
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