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max $partialdiff sub Y$ [ NOAA NCEP CPC FEWS Africa TEN-DAY RFEv2 est_prcp ]

Longitude grid: /X (degree_east) ordered (20W) to (55E) by 0.1 N= 751 pts :grid
Latitude grid: /Y (degree_north) ordered (39.95N) to (39.95S) by 0.1 N= 800 pts :grid

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