The effect of diffusion coefficient, depth of the channel, on- and off-rates of Ca2+ binding to dye on equilibration time. Time to equilibration after the channel closes as a function of depth as the αf increases due to increasing rc with (A) DCa=200µm2/s, (B) DCa=300µm2/s, (C) DCa=600µm2/s, and (D) DCa=700µm2/s.