Contour plots of ΔEa in kcal/mol
(values in white digits) as a function of (left) average DAD (DAD0) and force constant (f) and (right) DAD
of the long population (DADlong) and the difference in
free energy between the two populations (ΔG). The yellow dots represent the different mutants and are labeled
as follows: a, G121V; b, M42W; c, F125M; d, G121V-F125M; e, M42W-G121V;
f, M42W-F125M (errors for all the points are smaller than the dot
representing the data).