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    WORLDBATH432[bath
]
    grid: /X  (degree_east) periodic (0) to (0.8333435W) by 0.8333333 N= 432 pts :grid
    grid: /Y  (degree_north) ordered (90S) to (90N) by 0.8333333 N= 217 pts :grid
    WORLDBATH432 bath[ X Y |]
    $partialdiff sub X$   $partialdiff sub Y$ [ WORLDBATH432 bath ]  [ X Y |] |