Imaginary part of the normalized complex conductivity of the three models for (a) |$\Sigma _\mathrm{S} = 57.5\,$| mC m|$^{-2}$| and |$\varphi _\mathrm{d} = -46$| mV, (b) |$\Sigma _\mathrm{S} = 57.5\,$| mC m|$^{-2}$| and |$\varphi _\mathrm{d} = -165$| mV, (c) |$\Sigma _\mathrm{S} = 2.5\,$| mC m|$^{-2}$| and |$\varphi _\mathrm{d} = -46$| mV and (d) |$\Sigma _\mathrm{S} = 2.5\,$| mC m|$^{-2}$| and |$\varphi _\mathrm{d} = -165$| mV.