Figure 6.

Frequency spectra of the (a) real part $\mathrm{Re}\left({\dot{Z}}_{\mathrm{X}}\right)$ and (b) imaginary part $\mathrm{Im}\left({\dot{Z}}_{\mathrm{X}}\right)$ of the impedance ${\dot{Z}}_{\mathrm{X}}$ comprising the resistance $R_{\mathrm{X}}$ of 0.91 kΩ, resistance $R_{\mathrm{PX}}$ of 0 Ω, capacitance $C_{\mathrm{PX}}$ of 9.85 nF (parallel RC circuit), and capacitance $C_{\mathrm{SX}}$ of 9.76 nF. The dashed lines represent the theoretical curves calculated from Equations (9) and (10).