Vertically averaged crosscut C with Δ(δy) = 2′′. This cut passes through the green cross in Fig 6. In the upper panel, the magenta dashed curve shows the column density of warm H₂ obtained from v = 0–0 S (4) and S (2) lines, observed with MIRI-MRS, assuming a Boltzmann distribution at T₆₄(≃ 600 K, shown in Fig. C.5). In the bottom panel, the magenta dashed curve shows the 3.4/3.3 μm AIB intensity ratio (×10).