As an alternative to a simple linear baseline, usually guided by a part of the sweep where the faradaic current is zero (the range), I provide here a simple non-linear baseline, guided by both the range and by a part of the sweep where the faradaic current has reached a limiting value (the range), as illustrated in Figure . Note that if a ``swichy'' voltammogram is analyzed, the limiting current is that of the plateau, not the maximal (peak) current[4].

In Figure A, each pair of squares defines an interval, one in the region, and the other in the part of the voltammogram (empty and filled symbols, subscripts and , respectively). For both ranges, the average potentials , or , currents and slopes are measured.

In the range , a second order polynomial baseline ( ) is calculated so that (i) it goes through the points of coordinates () and ( ), and (ii) its slopes at these positions () match the values of . , , and , which define the polynomial baseline, and , are therefore the unique solution of the linear set of equations:

, , , .

In the ranges and , the baseline is linearly extrapolated.