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The probabilities, ρ, of the charge being at z (dimensionless)-position inside the protein for two changes in the electromechanical driving force (free energy of the system), 4×10−21 (dashed lines) and −4 × 10−21 J (dotted lines). The solid lines correspond to the unperturbed state of the membrane. The set of three curves is presented for three values of the DC-potential, −40, −10, and 100 mV
