Figure 20

Dynamical trajectories using γ near but lower than${\gamma }_2^c$Dynamical trajectories of the system (1) considering the values of parameters given in Table 2, except γ near but lower than ${\gamma }_2^c$. When T(0) = 0.42 (${\bar{Q}}^0$ is attracting for T(0) = 0.41), limit cycle with large amplitude circulating unstable ${\bar{Q}}_{>}^{*}$ occurs for γ = 2.519 × 10^-2. Regular oscillations are observed in all variables: C and E (a), T (b), P (c) and A (d). The scales of vertical and horizontal axes must be multiplied by the factors shown in the legends to obtain the actual values.