| 
     Ingrid:
     HTMLwords
    WORLDBATH[bath
]
    grid: /X  (degree_east) ordered (0.08333333W) to (0.08334351W) by 0.08333334 N= 4321 pts :grid
    grid: /Y  (degree_north) ordered (90S) to (90N) by 0.08333334 N= 2161 pts :grid
    $integral dX$   $partialdiff sub X$ [ WORLDBATH bath ]  [ X | Y]
    $integral dY$ [ WORLDBATH bath ][ X | Y] |