[gradsusr] Meteorological field in circular area

[Rodrigo de Souza Barreto Mathias]

Good morning!
I wanna calculate a meteorological field in a circular area with radius R starting  at a point (lat, lon). For example: average temperature in a circular area with 200 km of radius from a point 20N/020W. I don't know a specific function in Grads to do what I want. Could you help me with some function or a script using a mask?

Thanks a lot!
Rodrigo Mathias
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