Fig. 2.

Basin stability of equilibrium point $S_e$ in the $\left(k_1,k_2\right)$ plane showing the region where this equilibrium point is stable/quasi-stable (cyan) and the region where it is unstable (magenta) for $0\le k_1\le 0.09$,${10}^{-9}\le k_2\le 0.002$, while keeping $I_1=0.74,$$I_2=0.02,$$f_1=0.04$ and $f_2=0.01$