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Free energy surfaces in units of kBT calculated from simulations based on the acid/0 M salt, GuHCl with nε = 4, and pure-funnel models. The free energy surfaces are plotted as a function of the folding reaction coordinate Q (related to the fraction of native contacts)and either the ratio of the number of charge-charge contacts (CC) to hydrophobic-hydrophobic contacts (HH) (Upper) or the radius of gyration (Lower).
