Figure 4.

The measurements ${\overline{G}}_i$ (red points) of the “real” relaxation modulus (36) and optimal FMM models: sampling points-independent $G_M\left(t,{\mathit{g}}^{\ast }\right)$ and empirical $G_M\left(t,{\mathit{g}}_N^{\ast }\right)$ for $N$ measurements and normal distribution noises with the standard deviation $\sigma =8 \left[\mathrm{P}\mathrm{a}\right]$: (a) $N=100$; (b) $N=\mathrm{10,000}$.