These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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How to interpret levelSize.value
.
percentage
gives a width relative to result of outer radius minus
inner radius.
pixels
gives the ring a fixed width in pixels.
weight
takes the remaining width after percentage and pixels, and
distributes it accross all "weighted" levels. The value relative to
the sum of all weights determines the width.