Figure 6.

Analytical results for Investigation 2 for a system with λ₂ = 5.0. ${\lambda }_2^{H,cr}$ is shown as a function of λ₁. ${\lambda }_2^{H,cr}$ is the value derived in the analysis for the top-down bias to just produce equal rates in H₁ and H₂, overcoming the difference between the bottom-up inputs shown as λ₁ and λ₂.