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root mean sq [ NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic total_air_column PWAT ]

Latitude grid: /Y (degree_north) ordered (90N) to (90S) by 2.5 N= 73 pts :grid
Time grid: /T (months since 1960-01-01) ordered (Jan 1949) to (Aug 2014) by 1.0 N= 788 pts :grid

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CPTv10+