Figure 3

Bifurcation diagram of (11a)–(11b) with respect to B. Equilibrium points \((v_{0}^{p1}, y_{7}^{p1})\) lie on the lower red horizontal line \((v_{0}^{p1}, y_{7})\), and \((v_{0}^{p2}, y_{7}^{p2})\) on the upper red horizontal line \((v_{0}^{p2}, y_{7}^{p2})\). Dashed parts of the red lines represent saddle type, solid parts represent center type solutions. The true equilibrium points line on the black curve, \(F_{7}\). Dashed part of the black curve represents saddle type, solid parts stable focus type solutions. The saddle type equilibrium points along \((v_{0}^{p1}, y_{7}^{p1})\) and \((v_{0}^{p2}, y_{7}^{p2})\) change to center at the intersections with \(F_{7}\) at \(BP_{1}\) and \(BP_{2}\), respectively