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    WORLDBATH[bath
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    grid: /X  (degree_east) periodic (0) to (0.08334351W) by 0.08333333 N= 4320 pts :grid
    grid: /Y  (degree_north) ordered (89.91667S) to (89.91667N) by 0.08333334 N= 2159 pts :grid
    $partialdiff sub Y$ [ WORLDBATH bath ][ X | Y]
    WORLDBATH bath[ X | Y] |