These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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If no x values are given for the points in a series, pointStart defines on what value to start. For example, if a series contains one yearly value starting from 1945, set pointStart to 1945.
If combined with relativeXValue, an x value can be set on each
point. The x value from the point options is multiplied by
pointInterval and added to pointStart to produce a modified x
value.