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$integral dT$ [ NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic PressureLevel vpot ]

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) (250) (200) (150) (100) (70) (50) (30) (20) (10)] :grid
Time grid: /T (months since 1960-01-01) ordered (0000 1 Jan 1949) to (0000 1 Sep 2014) by 1.0 N= 789 pts :grid

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