# Welcome to the Highcharts Maps JS (highmaps) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# series.flowmap.colorIndex

Styled mode only. A specific color index to use for the series, so its graphic representations are given the class name `highcharts-color-{n}`.

Since v11, CSS variables on the form `--highcharts-color-{n}` make changing the color scheme very convenient.