This command can be used to turn off the zero contour
line.

Widget:
- Click your left mouse button on the Plot Zero Contour button in
the "Properties" window. The value of this button will toggle
between Yes and No.
Command:
Arguments :
- ON - the zero line is drawn on contour plots.
- OFF - the zero line is not drawn on contour plots.
Examples :
Notes :
- The default is on.
- This option remains in effect until changed.
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