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

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$partialdiff sub X$ [ NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic surface pressure ] climatology

Longitude grid: /X (degree_east) periodic (1.25W) to (3.75W) by 2.5 N= 144 pts :grid
Latitude grid: /Y (degree_north) ordered (88.75N) to (88.75S) by 2.5 N= 72 pts :grid
Time grid: /T (months since 01-Jan) periodic (Jan) to (Dec) by 1.0 N= 12 pts :grid

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