$partialdiff sub T$ [ $integral dX$ ( NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic MSL pressure ) climatology ]
| Longitude | grid: /X (degree_east) ordered (1.25W) to (1.25W) by 2.5 N= 145 pts :grid | 
|---|---|
| Latitude | grid: /Y (degree_north) ordered (90N) to (90S) by 2.5 N= 73 pts :grid | 
| Time | grid: /T (months since 01-Jan) periodic (16 Dec - 15 Jan) to (16 Nov - 15 Dec) by 1.0 N= 12 pts :grid |