Fig. 10.

Asymmetry of the SIR solutions as a function of $\rho$. The points are the values of the asymmetry computed numerically for discrete values of $\rho =1.5,2,3,\dots ,9$. The solid line is a fitted right line $A+B\rho$. The dashed line is the Jacobian $|\mathrm{d}{\tau }^{\prime }{/\mathrm{d}\tau |}_{i_{{}_0}}$ evaluated for $i_{{}_0}=0.84i_{\mathrm{peak}}$