comparable to that observed between data sets with the same conditions.

![ Current data and fits corresponding to the “MC without discharge” curves of Figs. 9(a) and 10 and parameters of Tables \[tab:1\] and \[tab:2\].[]{data-label="figSI-Data11"}](FigSI7_McGuyer_MarxCoil){width="8.5cm"}

![ Fit residuals for Fig. 3.[]{data-label="figSI-FitResiduals"}](FigSI8_McGuyer_MarxCoil){width="8.5cm"}

![ Estimated capacitance from variable RLC fits of measured current or voltage waveforms. (a) MC operation with the solenoid. The black curve is from the data in Fig. 3(b), while the red curve is from data in Fig. 7 in similar conditions but without visible discharge (the breakout point was removed). (b) MC operation without the solenoid. The curve is from the data in Fig. 4 and is likely affected by inductor saturation effects that violate the assumption of constant inductance. Dashed curves show the error from least-squares fit-parameter uncertainties. Horizontal blue dashed lines are the estimated erected Marx bank capacitances, without solenoid and terminal contributions. Grey regions mark when the waveforms are comparable to noise, and the capacitances less reliable. []{data-label="figSI-OldFig5"}](FigSI9_McGuyer_MarxCoil)

  ---------------------- --------- ------------------------ ------------------------ ------------------------ ------------ ------------------------- ------------------------- -----------
  [Data set]{}             $A_0$    $\alpha_1 \times 10^3$   $\alpha_2 \times 10^4$   $\alpha_3 \times 10^6$   $\omega_1$   $\omega_2  \times 10^3$   $\omega_3  \times 10^6$   $\phi_0$
                            Amp              MHz                   MHz$^{2}$                MHz$^{3}$           rad MHz          rad MHz$^{2}$             