Four-panel plot showing the separation versus 1 − e of the inner orbit. Based on the zero-lines in Figure 6. The left-hand side column corresponds to the vertical zero-line (|ΣΔe_ZLK| ≤ 0.05), and the right-hand side column corresponds to the horizontal zero-line (|ΣΔe_Scatterl ≤ 0.05). The top row shows the initial distribution at t = 0, while the bottom row shows the final distribution at t = t_f before the binaries merge.