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Computed pmfs for the complexation of benzene with K+and NH4+ in TIP4P water at 25 C and 1 atm with no scaling (red) and with scaling by 0.5 (black) for the 1/r4 treatment of cation-π interactions. r is the distance between the center of the benzene ring and the center atom of the cation. The systems included 2000 water molecules and used 15-Å cutoffs.
