Why I was asking
MSU: Thanks, this is perfect. Just exactly what I needed.
I see that people curious about what I'm doing with the data and where I see it. I'm working on strengthening my riding (and I'm a map nut, too), so I'm conscious of the grades I'm riding, always trying to bump up my threshhold.
In the process, I have discovered that cyclists and SOME maps talk about %s. But vehicles and signage and OTHER maps tend to use degrees. When I have used my pickup truck to scout routes, the truck records slopes in degrees. Because of the track, I now can more or less recognize a 3 degree slope from a 5 degree slope. But when I look at a cyclist's notes, they use percentages. But these are very, very different: a 5 degree slope is killer (for me) and a 5 percent slope is just hard. Eventually, I'll develop a gut instinct, but I'm a data-to-gut person, not a gut-to-data.
You have all given me just exactly what I need. Thank you.