Figure 10

An unstable order-2 limit cycle and a stable order-1 limit cycle: \(\pmb{b=1.8}\) , \(\pmb{p=1.3}\) , \(\pmb{c =0.52}\) , \(\pmb{\omega =0.1}\) , \(\pmb{q =0.23}\) , \(\pmb{\delta =0.3}\) , \(\pmb{\theta =0.8}\) , \(\pmb{\tau=1.6}\) , \(\pmb{V_{L}=6}\) . The initial value for \(\Gamma^{2}\) is 2.3017 and the initial value for \(\Gamma^{1}\) is 2.5213.