Grid variation and trend in G.M.T

Hello everyone,
I have GRACE-FO .nc grids of 18 months showing the equivalent water heights (EWH). I want to view the variation of the EWH with time within the region R29/41/-12/1 . Does anybody know how can I achieve this in G.M.T? Furthermore I want to see the trend of EWH and predict for a future time. Is this the work of grdtrend? Anyone comments are invaluable

I guess you can make a movie but this is a too vague question. Regarding grdtrend, the answer is no. As per the manual
Fit trend surface to grids and compute residuals

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