These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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The main color of the series. In heat maps this color is rarely used, as we mostly use the color to denote the value of each point. Unless options are set in the colorAxis, the default value is pulled from the options.colors array.
In maps, the series color is rarely used, as most choropleth maps use the color to denote the value of each point. The series color can however be used in a map with multiple series holding categorized data.