The same as Figure 5, but using gas and stars within R_1/2 only. The black arrows indicate z = 2 and z = 1 (except for ϵ_50,LBH, where the left arrow shows z ∼ 1.5, and ϵ_50,EBH, where the left arrow indicates z ∼ 1.3; these models have no gas inside R_1/2 at z = 1, so the arrows show the closest time with at least one gas particle in the region).