<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><div>Good morning!</div><div>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?</div><div><br></div><div>Thanks a lot!</div><div>Rodrigo Mathias</div></div></div></body></html>