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     Ingrid:
     HTMLwords
    WORLDBATH[bath
]
    grid: /X  (degree_east) periodic (0.04166667E) to (0.04165649W) by 0.08333334 N= 4320 pts :grid
    grid: /Y  (degree_north) ordered (89.95834S) to (89.95834N) by 0.08333334 N= 2160 pts :grid
    WORLDBATH bath[ X | Y]
    $partialdiff sub Y$ [ WORLDBATH bath ][ X | Y] |