Welcome to the Highcharts JS (highcharts) Options Reference

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

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series.treemap.yAxis

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