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Equilibrium susceptibility χ, specific heat C, and chevron plot as a function of T/Tm. (a) The peaks around T/Tm for 1W4H and 1W4E are more pronounced than those of 1BBL and 1W4J. (b) The linear folding (unfolding) arm for T < Tm (T > Tm) reflects the existence of a free energy barrier. The sum of folding and unfolding rates at T = Tm is equal to the relaxation rate, signifying the two-state folding behavior.
