Zero plane is a plane which separates the positive and negative numbers on a chart that has been plotted using both positive and negative values.

Zero Plane
Properties of the zero plane can be configured from the the 'Zero Plane' panel which is located in the 'Chart Selection' screen. The 'Zero Plane' panel will be displayed only if the 'Show advanced options' check box has been selected.

Zero Plane panel
Follwoing configurable parameters are available in the 'Zero Plane' panel:

mesh parameter enabled
Mesh parameter disabled