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Salt bridge PMFs for various solvent models. Panel A shows the PMF profiles for RAAE (Arg salt bridge) while panel B shows PMFs for KAAE (Lys salt bridge). GB-OBC, GB-Neck and GB-Neck2 used original mbondi2 radii set while GB-OBC 1.1 HN+ used mbondi2 with modified HN+(Arg). GB-Neck2.mb3 used the optimized radii set denoted mbondi3 (Table S4).
