To fit simple catalytic waves (`woa` for oxidative catalysis and
`wra` for reductive catalysis) adjusting a limiting current `ilim`, a mid point potential `Eapp` and an apparent number of
electrons `napp`. A polynomial baseline, Dirk's
method, should be first removed.

NB: this is equivalent to fitting the log transfrom of the wave to a straight line using the reg command

The current equations are:

(9) |

for reductive catalysis (

(10) |

for oxidative catalysis (

Christophe Leger 2009-02-24