# pH_i H_i(mM) relativeUnitCurrent scaledValue (from Doering & Lederer (1993) J Physiol 466:481-499)
6.0    0.001  0.08  0.182
6.4 3.981e-4  0.12  0.273
6.8 1.585e-4  0.16  0.364
7.2 6.310e-5  0.44  1.000
8.0     1e-5  0.68  1.545
9.0     1e-6  1.00  2.273