# pH_i H_i(mM) openProbability (from Xu et al (1996) Circ Res 79(6):1100-1109)
6.0      1e-3  0.22
6.5  3.162e-4  0.43
6.75 1.778e-4  0.63
7.0      1e-4  0.90
7.3  5.012e-5  1.00