map color in grads

[SUMIN WOO]

Dear all.

I saw the some image in Weather Map (-Forecast-Analysis of Current
Condtions) of GrADS web page.
I want to apply this map in my data(global model output).

In that map, it looks like gray color in the continent and light blue over
the ocean.
I copied that image and attached in this mail.

How to control the map color like that?

Please help me.

Any help will be very thankful for me.

SUMIN WOO
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