EIS	Electrical impedance spectroscopy
R-C values	Resistance and capacitance values
DSM	Double-shell model
ECF	Extracellular fluid
ICF	Intracellular fluid
$X_C$	Capacitive reactance
R	Resistance
$ℛ$	Measured resistance
$\aleph$	Measured reactance
$mean{ℛ}_{p,T_i}$	Mean value of measured resistance for ${\mathrm{NT}}_{\mathrm{r}}$
$mean{\aleph }_{p,T_i}$	Mean value of measured reactance for ${\mathrm{NT}}_{\mathrm{r}}$
$p$	Plant index $\mathrm{p}$ = 1, 2…, 4
$T_r$	Try index ${\mathrm{T}}_{\mathrm{r}}$ = 1, 2…, 5
$N{T}_r$	Total number of measurements (5)
$T_i$	Time index ${\mathrm{T}}_{\mathrm{i}}$ = 1, 2…, 16
$\omega$	Angular frequency
$Z\left(\omega ,T_i\right)$	Frequency- and time-dependent impedance
$R_1$	Cell wall + ECF resistance
$R_2$	Cell membrane resistance
$C_3$	Cell membrane capacitance
$R_4$	Vacuole resistance
$C_5$	Vacuolar membrane capacitance
$R_e$	Estimated resistance
$X_e$	Estimated reactance
$R_1^k$	New search-point candidate from old center point ${\mathrm{R}}_1$
$R_2^k$	New search-point candidate from old center point ${\mathrm{R}}_2$
$R_4^k$	New search-point candidate from old center point ${\mathrm{R}}_4$
$C_3^k$	New search-point candidate from old center point ${\mathrm{C}}_3$
$C_5^k$	New search-point candidate from old center point ${\mathrm{C}}_5$
$k$	Defined as iteration $\mathrm{k}=\mathrm{k}+1$
$s$	Vector search direction $\mathrm{s}=\left[-1 0 1\right]$
$\alpha$	Positive scalar denoting the distance moved along the search direction
$i{R}_1$	Vector search direction ${\mathrm{iR}}_1=\left[-1 0 1\right]$ for point candidate ${\mathrm{R}}_1^{\mathrm{k}}$
$i{R}_2$	Vector search direction ${\mathrm{iR}}_2=\left[-1 0 1\right]$ for point candidate ${\mathrm{R}}_2^{\mathrm{k}}$
$i{R}_4$	Vector search direction ${\mathrm{iR}}_4=\left[-1 0 1\right]$ for point candidate ${\mathrm{R}}_4^{\mathrm{k}}$
$i{C}_3$	Vector search direction ${\mathrm{iC}}_3=\left[-1 0 1\right]$ for point candidate ${\mathrm{C}}_3^{\mathrm{k}}$
$i{C}_5$	Vector search direction ${\mathrm{iC}}_5=\left[-1 0 1\right]$ for point candidate ${\mathrm{C}}_5^{\mathrm{k}}$
$\Delta err\_R_1$	Vector from ${\mathrm{R}}_1$ to ${\mathrm{R}}_1^{\mathrm{k}}$
$\Delta err\_R_2$	Vector from ${\mathrm{R}}_2$ to ${\mathrm{R}}_2^{\mathrm{k}}$
$\Delta err\_R_4$	Vector from ${\mathrm{R}}_4{ \mathrm{to} \mathrm{R}}_4^{\mathrm{k}}$
$\Delta err\_C_4$	Vector from ${\mathrm{C}}_3$ to ${\mathrm{C}}_3^{\mathrm{k}}$
$\Delta err\_C_5$	Vector from ${\mathrm{C}}_5$ to ${\mathrm{C}}_5^{\mathrm{k}}$
$Z_{err}^{\prime }\left(T_i\right)$	Impedance error as a function of frequency
$min{Z}_{err}^{\prime }\left(T_i\right)$	Minimum impedance error as a function of time
$Z_m\left(f,T_i\right)$	Measured impedance as a function of frequency and time
$Z_e\left(f,T_i\right)$	Estimated impedance as a function of frequency and time
${\widehat{R}}_1\left(T_i\right)$	Estimated value after curve fitting corresponding to cell wall + ECF resistance
${\widehat{R}}_2\left(T_i\right)$	Estimated value after curve fitting corresponding to cell membrane resistance
${\widehat{R}}_4\left(T_i\right)$	Estimated value after curve fitting corresponding to vacuole resistance
${\widehat{C}}_3\left(T_i\right)$	Estimated value after curve fitting corresponding to cell membrane capacitance
${\widehat{C}}_5\left(T_i\right)$	Estimated value after curve fitting corresponding to vacuolar membrane capacitance