AIB_{Irrad/Shielded} as function of I_AIB/H₂ flux ratio for the rotational H₂ 0–0 S(9) emission line at λ ≈ 4.69 μm (top left panel) and the ro-vibrational H₂ 1–0 S(1) emission line at λ ≈ 2.12 μm (top-right panel). We note that for M82, we only have access to H₂(4.69) as there is no observation available of H₂(2.12) emission line in NIRSpec yet. The bottom row shows the same ratio as a function of Pfund(λ ≈ 3.29 μm)/H₂(λ ≈ 4.69 μm) in the left panel and of G₀ in the right panel. For G₀, in purple, we indicate the area of AIB_{Irrad/Shielded} corresponding to galaxies. For all panels, blue circles are the Orion Bar NIRSpec values for each spaxel. Purple squares represent the positions of the galaxies studied in these diagrams. Spatially resolved galaxies are represented with a red edge and have error bars corresponding to 1 σ percentiles (5% and 95% of fit values for all galaxy spaxels). For these points, the median values of all the fits are shown.