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The electrostatic free energy (in kbT) computed with the uniform ion size-modified Poisson-Boltzmann equation, FSMPBE, of a low-dielectric spherical cavity of radius 20 Å and a central charge of −50e at concentrations of 2:1 salt, [MgCl2], of 0, 0.01, 0.02, 0.05, and 0.1 M and an ion radius of 1.5 Å is plotted against the logarithm of the concentration of 1:1 salt, [NaCl].
