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Free-energy profiles for H+, K+, and H3O+ as a function of the z axis through the LS2 channel, for which the pore radius is represented as the background gray scale (the exact pore radius profile can be found in Wu and Voth (15)). The error bars of the profiles range from ±0.2 to 0.5 kcal/mol and are omitted for the clarity of the curves.
