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Reply to "Hilly calibration courses"

Variation of my rides of September 7:

The 12 flat rides (C-D and D-C ) had a total span of 3.15 inches, less than a count. This is pretty good riding.

The four downhill rides (B-A) had a span of 7.5 inches, just under two counts.

The four uphill rides (A-B) had a span of 11 inches. Not good, indicating erratic riding. It's hard to maintain straightness on a steep uphill.

On the more modest grade of C to B the agreement was what one would expect from flat riding, and anyone examining the data would have no reason to suspect any hill was present.
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