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$partialdiff sub Y$ [ WORLDBATH432 bath ]

Longitude grid: /X (degree_east) periodic (0) to (0.8333435W) by 0.8333333 N= 432 pts :grid
Latitude grid: /Y (degree_north) ordered (89.58334N) to (89.58334S) by 0.8333334 N= 216 pts :grid

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