Fig. 3.

Test 3 Three different chemoattractant distributions used for comparing models $i)-iv)$. The chemoattractant profile is given by (72) with $m_{\mathcal{S}}=10$ and (a) ${\sigma }_{\mathcal{S}}^2=0.05$, corresponding to $l_{\mathcal{S}}=0.002$, (b) ${\sigma }_{\mathcal{S}}^2=0.25$, corresponding to $l_{\mathcal{S}}=0.055$, and (c) ${\sigma }_{\mathcal{S}}^2=1.8$, corresponding to $l_{\mathcal{S}}=0.25$. The fibers distribution in sketched in (d) (color figure online)