[gradsusr] Fill missing data of Potential Temperature (K) for no defined model pressures

[Amides Figueroa]

Hi all, im trying to display theta (Potential Temperature) from a WRF ARW
model output but the model not calculate for points like mountains see the
attached image for theta display at 950 hPa level, the blank squares
represent elevations above 950 hPa because that is not data, how i can fill
the missing values (like interpolation maybe) to get a matematical data for
theta in that points??

Thanks!

Juan José.
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