$partialdiff sub X$ max mean [ NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic PressureLevel phi ]
Longitude | grid: /X (degree_east) periodic (1.25W) to (3.75W) by 2.5 N= 144 pts :grid |
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Latitude | grid: /Y (degree_north) ordered (90N) to (90S) by 2.5 N= 73 pts :grid |