NOZERO
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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