CPTv10+ files for mean $partialdiff sub X$ $partialdiff sub T$ [ Princeton wspd ]

Princeton[prcp tmax wspd tmin ]
grid: /X (degree_east) periodic (0.25E) to (0.25W) by 0.5 N= 720 pts :grid
grid: /Y (degree_north) ordered (89.75S) to (89.75N) by 0.5 N= 360 pts :grid
grid: /T (days since 1960-01-01 00:00:00) ordered (0000 1 Jan 1948) to (0000 31 Dec 2008) by 1.0 N= 22281 pts :grid
mean $partialdiff sub X$ $partialdiff sub T$ [ Princeton wspd ] 0 m[ X Z | T]