These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Cumulative Sum feature replaces points' values with the following formula:
sum of all previous points' values + current point's value.
Works only for points in a visible range.
Adds the cumulativeSum field to each point object that can be accessed
e.g. in the tooltip.pointFormat.
With dataGrouping enabled, default grouping approximation is set to sum.