Demonstrating the χ² convergence for each of the seven parameters for Model P at day 385. For each panel, we keep the optimized parameters the same except for the parameter being varied. Panel (A) shows temperature (T₁) convergence for both the CO fundamental and overtone bands. For panels (B)-(G) we only show χ² of the fundamental band because the overtone does not show significant χ² differences between models (see Figure 5). Panel (B) shows the density structure (n), (C) the inner velocity edge (v₁), (D) the width of the molecular region (Δv), (E) the clump density contrast (f_c), (F) the clump size (r_R), and (G) the clump shape (ϵ). For discussion on the shapes and jumps, see Section 4.1.