[gradsusr] Problem subtracting two files

[Syed Ahsan Ali]

Dear All

I am having problem in subtraction of two files, one is CRU and other from
RCMs output, both are at 0.5deg but in grads subtraction gives error that
Grids dont match, I have also tried this thing using grads lterp fuction
but then grads gives some unknow error.
Please Help!

Regards
Ahsan
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