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

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$integral dY$ root mean sq [ NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic PressureLevel vtemp ]

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

Get the data for

CPTv10+