[gradsusr] RMSE in grads

[Lyndon Mark Olaguera]

Hello,
Im a new user in grads.
I would like to make an RMSE plot to evaluate my analysis nudging in wrf.
I have three files to compare.
A control run, a run with surface nudging and a run with observation
nudging.
Can you help me make a script for this?
the plot should contain an RMSE of the three runs. How do i do this in
grads?
i will appreciate any help.

I attached the files here..

Lyndon
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