categoryAxis.autoBaseUnitSteps Object

The discrete categoryAxis.baseUnitStep values when either categoryAxis.baseUnit is set to "fit" or categoryAxis.baseUnitStep is set to "auto".

Example - set category axis auto base unit steps

<div id="chart"></div>
    categoryAxis: {
        categories: [
            new Date("2012/02/01 00:00:00"),
            new Date("2012/02/02 00:00:00"),
            new Date("2012/02/20 00:00:00")
        baseUnitStep: "auto",
        autoBaseUnitSteps: {
            days: [3]
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