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Mean ionic activity coefficient in NaCl aqueous solution from MD simulations with different force fields. “amoeba18” is the revised AMOEBA ion parameters with special pairwise vdW;40 “amoeba09” is the earlier AMOEBA parameters of Grossfield et al.15 Experimental, amoeba18 and TIP4Pew/JC data are taken from Wang.40 Error bars represent standard error.
