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

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

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) (360) ordered [ (2359 18 Mar 1949 - 2359 19 Mar 1949) (2359 21 Aug 1949 - 2359 22 Aug 1949) (2359 23 Mar 1950 - 2359 24 Mar 1950) ... (0002 15 Sep 2023 - 0002 16 Sep 2023)] N= 166 pts :grid

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