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Free energy distribution in a three-bond chain C4 system, plotted as a function of the torsion angle. The negative of the Fixman potential, , is very close to the free energy in the TORSIONAL simulation, demonstrating that the application of the Fixman potential corrects the bias in the free energy landscape of the TORSIONAL model. The free energies were calculated using bins of size 7.2° for the torsion angles.
