This is useful if you believe that the high driving force residual slope in the voltammogram results from a distribution of the orientation of the enzyme molecules on the surface. The model described in ref.  can then be used to fit the data after removing a linear baseline extrapolated from the i=0 part of the voltammogram, see the reg command.
For oxidative catalysis, the current equations are:
(with ) when the limiting current is reached (so2l) and
For reductive catalysis (so2l and sr2n), the current
equations read as eqs 9a and 10 but with