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$partialdiff sub Y$ $integral dX$ $integral dY$ $partialdiff sub X$ [ WORLDBATH bath ]

Longitude grid: /X (degree_east) ordered (0.04166667W) to (0.04165649W) by 0.08333334 N= 4321 pts :grid
Latitude grid: /Y (degree_north) ordered (90N) to (90S) by 0.08333334 N= 2161 pts :grid

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