[C#]	public void addZone(double startValue, double endValue, int color);
[VB]	Public Sub addZone(startValue As Double, endValue As Double, color As Integer)

Adds a zone to the chart.

A zone is a range of values. For example, "10 to 20" is a zone. Typically, a zones are used to classify data ranges. For example, you may classify 0 - 60 as the normal zone, 60 - 90 as the warning zone, and 90 - 100 as the critical zone.

A zone based on a horizontal axis will be drawn as a vertical band. A zone based on a vertical axis will be drawn as a horizontal band. Zones are always drawn at the back of the plot area.

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