Fig. A.4

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χ2 maps for the 12CO2,13CO2, C2H2, and H2O slab model fits in the 13.5-17.5 µm wavelength range. The color-scale indicates , the three black contours correspond to the 1σ, 2σ, and 3σ levels, and the white contours show the emitting radii in au. The best-fit model is indicated with a blue cross, and corresponds to
. On the bottom-right panel, the best H2O fit using the isolated lines from Tables 6 and 7 from Banzatti et al. (2024) is depicted with a white star.
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