These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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If categories are present for the xAxis, names are used instead of
numbers for that axis. Since Highcharts 3.0, categories can also
be extracted by giving each point a name and setting
axis type to
category. However, if you have multiple
series, best practice remains defining the
categories: ['Apples', 'Bananas', 'Oranges']