Ah!  A problem your macro doesn't take into account (not sure how it 
would, either, but who knows?) is that of depressions, where a given 
contour line loop isn't an ascending hill, but a shallower area.  On the 
other image I'd rendered, they're easy to spot because the fade is on 
the outside rather than the inside, so can be marked appropriately when 
redrawing everything by hand.

--
Tim Cook
http://empyrean.sjcook.com

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