These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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The offset for contour line positioning. Shifts the contour levels so
lines and bands are drawn at contourOffset + n * contourInterval
instead of n * contourInterval.
Example: with contourInterval: 10 and contourOffset: 5, levels are
at 5, 15, 25, etc. Use this to align levels with a reference value
without changing the data. Non-positive values are treated as 0.