[gradsusr] draw contour border

[Mubashar Ahmad]

Dear GrADS users,

I would like to draw 0 contour border (over tropical  ITCZ region) in the
upper panel of attached figure. If I simply use command "set gxout contour,
or 'set clevs 0'  and then display my variable it will draw many contours,
but I don't want to display 0 values every where, instead  I want it across
ITCZ area (tropical region, red color) in the upper panel of attached
figure. How can I do it in GrADS?

Thanks and best regards,

Mubashar
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