User blog comment:Nayuta Ito/Trying to Make a Continuous Psi Level/@comment-30754445-20171226045826

I don't think that using my letter notation to make Psi Levels continuous is a good idea... The whole reason I've made this thing is that letter notation is way too unsmooth to serve as a proper continuous scale.

The effect isn't too bad for F (and probably not much worse than the bumpiness introduced by "setting round psi levels to round large numbers" maxim), but in general the letters are not suitable for this kind of thing.