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The reduced excess chemical potential for a free divalent cation in a 20 μM protein solution is indicated as a function of monovalent salt concentration. The (superimposed) solid lines refer to the SC8 model and the broken lines to the SC24 model. Lines marked by solid circles are calculated with a dielectric boundary radius Rd = 14Å; lines without symbols refer to Rd = 0Å. The thin broken line shows the excess chemical potential of a divalent ion in a bulk salt solution.
