NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic PressureLevel[vpot CBVQ CBTMW CBUW phi temp u relv CBTW v CBMZW psi vtemp vvel rhum CBUQ CBTZW qa CBQW reld CBVW ]
grid: /X (degree_east) periodic (0) to (2.5W) by 2.5 N= 144 pts :grid
grid: /Y (degree_north) ordered (90N) to (90S) by 2.5 N= 73 pts :grid
grid: /P (mb) ordered [ (1000) (925) (850) (700) (600) (500) (400) (300)] :grid
grid: /T (months since 1960-01-01) ordered (Jan 1949) to (Aug 2014) by 1.0 N= 788 pts :grid
$partialdiff sub X$ [ NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic PressureLevel CBQW ][ X Y | P T]

CPTv10+ files for $partialdiff sub X$ [ NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic PressureLevel CBQW ]