The shift in SSA predominantly reproduces the conduction changes in the shifted I _Na subpopulation. (A) CV is shown as a function of gap junction conductance g_gap and cleft widths of 10 (right), 20 (middle), and 30 (right) nm, for the baseline/polarized (black) and mix/homogeneous-polarized (both shifts, magenta; only SSA, blue; only SSI, green) distributions. (B) The ratio of CV values for different distributions, with the mix/homogeneous-polarized distributions, are shown.