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

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$partialdiff sub Y$ max $partialdiff sub Y$ [ NOAA NCEP EMC CMB GLOBAL Reyn_SmithOIv1 monthly sst ]

Latitude grid: /Y (degree_north) ordered (88.5S) to (88.5N) by 1.0 N= 178 pts :grid
Time grid: /T (months since 1960-01-01) ordered (Dec 1989) to (Nov 1999) by 1.0 N= 120 pts :grid

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