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The logarithm of the difference between the electrostatic free energy (in units of kbT) given by the uniform ion size-modified Poisson-Boltzmann equation and that given by the standard nonlinear Poisson-Boltzmann equation without a Stern layer, log(FSMPBE−FNLPBE), is plotted against log(rion) for 3 different values of NaCl concentration. The slopes of the curves are 3 to within 0.67%.
