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

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The Y axis value to serve as the base for the area, for distinguishing between values above and below a threshold. The area between the graph and the threshold is filled.

- If a number is given, the Y axis will scale to the threshold.
- If
`null`

, the scaling behaves like a line series with fill between the graph and the Y axis minimum. - If
`Infinity`

or`-Infinity`

, the area between the graph and the corresponding Y axis extreme is filled (since v6.1.0).