These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Together with gapSize, this option defines where to draw gaps in the graph.
"relative" (default), a gap size of 5
means that if the distance between two points is greater than
5 times that of the two closest points, the graph will be
"value", the gap is based on absolute
axis values, which on a datetime axis is milliseconds. This
also applies to the navigator series that inherits gap
options from the base series.