Figure 3

Phase-parameter portrait of system (10) given as a cut of the positive parameter space (γ, β, δ) for an arbitrary fixed value of β > 1. The dots represent the equilibria of the model. The cross-sections of the full three-dimensional parametric portrait are different for β < 1 (see text and Fig. 1) and β > 1 (the presented figure). The boundaries of the domains are α₁ = {(δ, β, γ) : δ = β}, α₂ = {(δ, β, γ) : γ = δ}, and α₄ = {(δ, β, γ) : γ = δ + 1 - β}.