Accessing data using CPT (ingrid imposes a limit of 3999 points in the degrees-east grid)

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$integral dY$ $partialdiff sub T$ [ NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic PressureLevel vtemp ]

Longitude grid: /X (degree_east) periodic (0) to (2.5W) by 2.5 N= 144 pts :grid
Latitude grid: /Y (degree_north) ordered (91.25N) to (91.25S) by 2.5 N= 74 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 16 Jan 1949 - 2400 14 Feb 1949) (0000 15 Feb 1949 - 1200 16 Mar 1949) (1200 16 Mar 1949 - 2400 15 Apr 1949) ... (0000 16 Apr 2021 - 1200 16 May 2021)] N= 868 pts :grid

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