Allowing Negative Values

Use the AxisAllowNegative property to specify whether or not to permit negative values for r. When AxisAllowNegative is enabled, the chart shifts the axis to accommodate negative values. When AxisAllowNegative is disabled, a negative radius is interpreted as a positive radius rotated 180 degrees.

The AxisAllowNegative property is located on the Polar/Radar Tab (Axes) on the Property Pages.