Figure 2

(color online) Displays the Hopf bifurcation regions of the delay values τ versus the parameters of α and β. The semi-analytical results with two terms are plotted. The parameters are \(D=0.3\), \(\mu =5\), and \(\beta =0.7\) in the \(\tau -\alpha \) plane (dotted red curve), while \(\alpha =0.7\) for the \(\tau -\beta \) plane (black dash curve)