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. 1999 Jan 1;113(1):111–124. doi: 10.1085/jgp.113.1.111

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N-channel P _o varies across patches. The mean P _o (including null sweeps) for each patch is plotted for all voltages examined. Data from each of the 10 single N-channel patches is shown as a different symbol, and the same symbol code is used again in Fig. 4. The solid line is from a single Boltzmann fit to all points. The parameters for the line are V_1/2 = 29 mV, slope = e-fold for 6 mV, and maximum P _o = 0.49. The dashed line is single Boltzmann fit constrained to P _o = 1. For this fit, V_1/2 = 47 mV and slope = e-fold for 13 mV.