3, 4, and 7 using the approach described in the previous section. This reconstruction assumes the effective inductance is constant, which is likely a good approximation for the data of Figs. 3 and 7. Unfortunately, no reproducible trend was observed in this and other data that could be attributed to spark discharge, likely because of a larger variability in component effects.

The solenoid was removed for the data of Fig. 4, increasing the current flowing through the stage inductors and potentially saturating their ferrite cores. Therefore, the reconstruction for the data of Fig. 4 is likely incorrect, and instead represents a fictitious set of time-varying RC parameters with constant inductance that would lead to a similar voltage waveform.

The capacitance estimation of Fig. 9 used an inductance $L$ of 7.4 mH for the current data with the solenoid and of 90 mH for the voltage data without the solenoid. Figs. 10 and 11 provide consistency checks of the approximations (\[Iapprox\]) and (\[Vapprox\]) required for this estimation, and show corresponding estimated resistances. The dashed curves shown in Figs. 9, 10, and 11 were estimated from error propagation of the fit parameter uncertainties.

For Fig. 3, the inferred maximum voltage using the 