Thanks Rafal, I tried again and managed to see the curves. I note you don't have any data in the film speed curve for higher than N+1. I initially thought it was because you only developed for 16 minutes but I see if you added another point out at N+2 on the summary plots that you would have hardly any difference in film speed between N+1 and N+2. This is a consequence of your diml speed curve asymptoting. Additionally your film speed curve is concave up whereas mine is concave down for nearly the same combination of film and dev (I used XTOL 1+2 rather than 1+1).