d STB-7 tt5.  Simple chemical equilibrium.
d STB insert by Paul Geiger, USC School of Medicine.
d Support:  pgeiger@@vm.usc.edu
d Note:  Create any working directory and copy materials into it.  Enter
d Stata.  Given any data set containing Ao, B0, Co, Do, Keq 
d (e.g., equil.dta), type "do equil" to obtain a, b, c, x, Aeq, Beq, 
d Ceq, Deq, and X_Ao.

f tt5/equil.do
f tt5/equil.dta
f tt5/equil.gph