chemical rates work at last

density/2e7 was the magic number that make the rates work.

Rimmer still dead, no word from John, though he has apparently run mac os update on my comp, leaving me with a new version of iTunes and a loss of all stored passwords, but no effect on Rimmer...

Since then, been extrapolating a million lambdas by hand as I need a rimmer bound fortran program to do it for me...