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NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic total_air_column PWAT

Longitude grid: /X (degree_east) periodic (0) to (2.5W) by 2.5 N= 144 pts :grid
Latitude grid: /Y (degree_north) ordered (90N) to (90S) by 2.5 N= 73 pts :grid
Time grid: /T (days since 1960-01-01) ordered [ (Jan 1949) (Feb 1949) (Mar 1949) ... (Aug 2014)] N= 788 pts :grid

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