These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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The X axis range that each point is valid for. This determines the width of the column. On a categorized axis, the range will be 1 by default (one category unit). On linear and datetime axes, the range will be computed as the distance between the two closest data points.
null means it is computed automatically, but this
option can be used to override the automatic value.