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$partialdiff sub T$ $partialdiff sub T$ [ NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic PressureLevel rhum ]

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
Pressure grid: /P (mb) ordered [ (1000) (925) (850) (700) (600) (500) (400) (300)] :grid
Time grid: /T (days since 1960-01-01) ordered [ (1200 31 Jan 1980 - 1200 1 Mar 1980) (1200 1 Mar 1980 - 1800 31 Mar 1980) (1800 31 Mar 1980 - 0600 1 May 1980) ... (0600 1 Jul 2014 - 2400 31 Jul 2014)] N= 414 pts :grid

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