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.
null, the scaling behaves like a line series with fill between the graph and the Y axis minimum.
-Infinity, the area between the graph and the corresponing Y axis extreme is filled (since v6.1.0).