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$partialdiff sub X$ [ WORLDBATH432 bath ]

Longitude grid: /X (degree_east) periodic [ (0.4166667E) (0.4166667E) (1.25E) ... (1.25W)] N= 432 pts :grid
Latitude grid: /Y (degree_north) ordered (90N) to (90S) by 0.8333333 N= 217 pts :grid

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