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Don't feel under any obligation. I made this site because I'm a nut for this sort of data and love looking at pictures of hill gradients. There's really something mystical about the whole thing. But that's probably just me. However, if you find this site as valuable as I do, I'd happily take whatever you think you should give to assuage your guilt.

If you're a race promoter, however, and want to use the gradient maps for publicizing your race...well, then I'd like you to give me some money or at least feel a little guilty about it. The pictures are public domain, but that doesn't mean you can't provide me with a little compensation for the value you clearly get out of them.

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