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$integral dP$ [ NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic PressureLevel reld ]

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
P grid: /P (mb) ordered [ (1037.5) (962.5) (887.5) (775.0) (650.0) (550.0) (450.0) (350.0) (275.0) (225.0) (175.0) (125.0) (85.0) (60.0) (40.0) (25.0) (15.0) (5.0)] :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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