# Welcome to the Highcharts Gantt JS (gantt) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

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# plotOptions.series.pointInterval

If no x values are given for the points in a series, `pointInterval` defines the interval of the x values. For example, if a series contains one value every decade starting from year 0, set `pointInterval` to `10`. In true `datetime` axes, the `pointInterval` is set in milliseconds.

It can be also be combined with `pointIntervalUnit` to draw irregular time intervals.

If combined with `relativeXValue`, an x value can be set on each point, and the `pointInterval` is added x times to the `pointStart` setting.

Please note that this options applies to the series data, not the interval of the axis ticks, which is independent.