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    WORLDBATH432[bath
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    grid: /X  (degree_east) periodic [ (0.4166667E) (0.4166667E) (1.25E) ... (1.25W)] N= 432 pts :grid
    grid: /Y  (degree_north) ordered (89.58334S) to (89.58334N) by 0.8333334 N= 216 pts :grid
    $integral dY$   $partialdiff sub Y$   $partialdiff sub X$   detrended-bfl [ WORLDBATH432 bath ]      [ X Y |] |