These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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When true, X values in the data set are relative to the current
pointStart, pointInterval and pointIntervalUnit settings. This
allows compression of the data for datasets with irregular X values.
The real X values are computed on the formula f(x) = ax + b, where
a is the pointInterval (optionally with a time unit given by
pointIntervalUnit), and b is the pointStart.