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     Ingrid:
     HTMLwords
    WORLDBATH432[bath
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    grid: /X  (degree_east) ordered (0.4166667W) to (0.416687W) by 0.8333333 N= 433 pts :grid
    grid: /Y  (degree_north) ordered (90.41666S) to (90.41666N) by 0.8333333 N= 218 pts :grid
    $partialdiff sub X$   $integral dY$   $integral dX$   detrended-bfl [ WORLDBATH432 bath ]      [ X Y |] |