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If no x values are given for the points in a series,
defines the interval of the x values. For example, if a series
contains one value every decade starting from year 0, set
10. In true
datetime axes, the
is set in milliseconds.
It can be also be combined with
pointIntervalUnit to draw irregular
Please note that this options applies to the series data, not the interval of the axis ticks, which is independent.