Figure 3.

Basis functions $\mathcal{h}\left(\tau \right)=e^{-{\displaystyle \frac{\alpha k}{\tau }}}/\tau$ (15) of the relaxation time spectrum model ${\mathcal{H}}_K\left(\tau \right)$ (14) for two time-scaling factors, $\alpha$: (a) $\alpha =0.001 \left[\mathrm{s}\right]$; (b) $\alpha =0.1 \left[\mathrm{s}\right]$; $k=1, 5, 10, 20, 100, 500$.