Figure 2.

Rate curves [6] of system (2) for the parameters k₁ = 8, k₂ = 1, k₃ = 1, k₄ = 1.5. The thick solid line is the rate of the removal of reactant X (sum of the negative terms in ) and the thick dashed line the rate of production (positive term in ). The three crossings indicate the three steady states . The thin lines show the contributions of the three degradation terms separately: quadratic term k₂x² dashed, the effectively cubic term k₃ xy solid, and the linear term k₄ x dotdashed. The inset shows a zoomed version for x < 2.1.