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     Ingrid:
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     HTMLwords
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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
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    grid: /Y  (degree_north) ordered (90S) to (90N) by 0.08333334 N= 2161 pts :grid
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    $integral dY$   detrended-bfl   $partialdiff sub X$ [ WORLDBATH bath ]    [ X | Y]
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