Maximum imaginary conductivity (a and c) and relaxation time (b and d) for the the new (a and b) and the old analytic model (c and d). The length of the wide pore is fixed to |$2 L_1 = 2 \times 10^{-5}$| m and that of the narrow pore to |$2 L_2 = 2 \times 10^{-4}$| m. The EDL parameters are |$\Sigma _\mathrm{S} = 7.8\,$| mC m|$^{-2}$| and |$\varphi _\mathrm{d} = -75$| mV. The grey area indicates the parameter space with |$r_2 > r_1$| that has not been considered. The white area (a and b) indicates the parameter combination where no distinct low-frequency peak was observable.