@Michael R: Assuming the slope is about .58, then I think the little horizontal ticks would be 0.2 log-E units each.
@PE: Sanitized? That didn't occur to me. There's no question that Michael and I both got upswept curves, but not severe enough to hurt folks much. Just a little more burning needed. Kodak didn't see that, and it makes me wonder what's going on. And the recent report of felt-trap dust outside and inside 35mm canisters makes me wonder some more. I'm glad I tuned the Mocon developer to work well with Ilford films, particularly Delta 400.