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$integral dX$ $partialdiff sub X$ [ NOAA NCEP EMC CMB GLOBAL Reyn_SmithOIv2 monthly mask ]

Longitude grid: /X (degree_east) ordered (0.5W) to (0.5W) by 1.0 N= 361 pts :grid
Latitude grid: /Y (degree_north) ordered (89.5N) to (89.5S) by 1.0 N= 180 pts :grid

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