Fig. 5.

Numerical simulation of: time series (a) and two dimensional views (b) of the attractor projected, illustrating the complexity of the system for ${\text{I}}_1=0.745,f_1=0.01,k_1=0.000085,$$I_2=0.02,$  $f_2=0.09$ and $k_2=0.001$ with the initial condition $\left(-2,-5,-0.8,-1\right)$