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 CBVQ ] climatology

Longitude grid: /X (degree_east) periodic (1.25E) to (1.25W) 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 [ (16 Jan 1960 - 15 Feb 1960) (16 Feb 1960 - 15 Mar 1960) (16 Mar 1960 - 15 Apr 1960) (16 Apr 1960 - 15 May 1960) (16 May 1960 - 15 Jun 1960) (16 Jun 1960 - 15 Jul 1960) (16 Jul 1960 - 15 Aug 1960) (16 Aug 1960 - 15 Sep 1960) (16 Sep 1960 - 15 Oct 1960) (16 Oct 1960 - 15 Nov 1960) (16 Nov 1960 - 15 Dec 1960) (16 Dec 1960 - 15 Jan 1961)] :grid

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