# 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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# xAxis.breaks.breakSize

A number indicating how much space should be left between the start and the end of the break. The break size is given in axis units, so for instance on a `datetime` axis, a break size of 3600000 would indicate the equivalent of an hour.