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Free-energy difference between the β-hairpin states bhp1 and bhp2 (i.e., ΔGbhp2 – ΔGbhp1). ΔGAB values along with the associated error are shown as a function of the final restraint strength, kf. For kf larger than 2 kcal/mol/Å2 ΔGAB has converged to a value of 1.88 ± 0.13 kcal/mol.
