These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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When this is true, the series will not cause the Y axis to cross the zero plane (or threshold option) unless the data actually crosses the plane.
For example, if softThreshold is false, a series of 0, 1, 2,
3 will make the Y axis show negative values according to the
minPadding option. If softThreshold is true, the Y axis starts
at 0.