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Re: equipotentials

I don't think map makers concern themselves very much with the
question of what to do with contour lines over horizontally level
surfaces for at least two reasons: a) they don't generally exist over
large enough areas to have to deal with that carefully and b) they
never correspond to the altitude of a contour line.

The only problem would arise when dealing with horizontally level
surfaces of nonnegligible extent that are *close* to the altitude of
a contour line. Even then the only problem is trying to figure out
whether the altitude is above or below the contour level.

John Mallinckrodt
Cal Poly Pomona