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I've been researching water profiles today and I just saw a video today about that button. Yet... it's missing. I guess this was removed in later releases of the product? Was the tool just not reliable?
It is an iterative optimization routine designed to find the least squares fit to the ending mineral/salt concentrations from the starting point and the contributions of each of the listed possible mineral salts additions.
I last programmed one in Fortran for seven variables back in 1981 when I still had some interest in programming computers.