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$partialdiff sub Y$ [ WORLDBATH bath ]

Longitude grid: /X (degree_east) periodic (0) to (0.08334351W) by 0.08333333 N= 4320 pts :grid
Latitude grid: /Y (degree_north) ordered (89.95834N) to (89.95834S) by 0.08333334 N= 2160 pts :grid

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