FIGURE 9.

Effect of strong parameter variations on oscillations. Each point represents a simulation where one parameter has been doubled or halved, keeping the other parameters constant. Amplitude and period are plotted relative to the amplitude and the period of the control. Measured amplitude is the amplitude of total FRQ oscillation. (solid triangle, δ_RNA; solid circle, θ; solid square, δ_FRQ; open triangle, ρ_WCC; open square, ρ_FRQ; open circle, β; open diamond, δ_WCC; and × symbol, other parameters.) (A) One-loop model (parameters of Fig. 3). (B) One-loop model (with δ_FRQ = 0.25 h⁻¹, ρ_FRQ = 20 mol h⁻¹, θ = 0.23 h⁻¹, and α = 4 mol⁻¹ h⁻¹, with other parameters the same as Fig. 3). (C) First two-loop model (parameters of Fig. 5). Five parameters destroy oscillations. (D) Second two-loop model (parameters of Fig. 6).