[9] This effect is usually accompanied by a corresponding reduction in current density at the same position, thus meeting the definition of type M overshoot. Changes in P at 25 kΩ are shown in Figure in a ΔP versus Ī curve and can be compared to the power density curve in Figure . Insofar as ΔP and ΔĪ determine the presence of power overshoot, we plot ΔP versus ΔĪ (Supplementary Materials, Section S4). It is clear that while Ī continuously increases (i.e., ΔĪ > 0, always) even as ΔP becomes negative near the former power density apex (Rext=25 kΩ), the values of Ī at 25 kΩ and ΔĪ between 40 and 25 kΩ are both progressively reduced. From these trends, it appears likely that further degradation of the MFC performance would have resulted in ΔĪ < 0 (classic type M overshoot) for the data pair marked 3 in Figure , similar to the data pairs marked 1 and 2.