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$partialdiff sub T$ $partialdiff sub X$ [ NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic surface pressure ]

Longitude grid: /X (degree_east) periodic (1.25W) to (3.75W) 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 [ (16 Jan 1980 - 15 Feb 1980) (16 Feb 1980 - 15 Mar 1980) (16 Mar 1980 - 15 Apr 1980) ... (16 Jul 2014 - 15 Aug 2014)] N= 415 pts :grid

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