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NOAA NCEP EMC CMB GLOBAL Reyn_SmithOIv2 weekly mask

Longitude grid: /X (degree_east) periodic (0.5E) to (0.5W) by 1.0 N= 360 pts :grid
Latitude grid: /Y (degree_north) ordered (89.5N) to (89.5S) by 1.0 N= 180 pts :grid

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