These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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The approximate pixel width of each group. If for example a series
with 30 points is displayed over a 600 pixel wide plot area, no
grouping is performed. If however the series contains so many points
that the spacing is less than the groupPixelWidth, Highcharts will
try to group it into appropriate groups so that each is more or less
two pixels wide. Defaults to 5.