# pH_i H_i(M) relativeUnitCurrent error (from Ito et. al (1992) Pflugers Arch. 422:280-286)
8.0     1e-5  1.00  0.010
6.8 1.585e-4  0.95  0.022
6.5 3.162e-4  0.91  0.061
6.2 6.310e-4  0.82  0.029
6.0     1e-3  0.79  0.145
5.7 1.995e-3  0.75  0.000