[gradsusr] Urgently need help

[Martin Addi]

hi to all
i have attached two files;preci.png & sup.png.i am superimposing
rh,sst & winds of which i have done in sup.png but the point is i want
to display the rh for only lon -20 30 & lat 4 20 as shown in the image
preci.png.what should i do to display the rh at specific domain and
still show the global sst and the wind as in the image sup.png without
displaying the rh in other region apart from my domain.thank you
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