Welcome to the Highcharts Stock JS (highstock) Options Reference

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

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series.ao.xAxis

When using dual or multiple x axes, this number defines which xAxis the particular series is connected to. It refers to either the {@link #xAxis.id|axis id} or the index of the axis in the xAxis array, with 0 being the first.