Fig. 6.
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Zoom-in of the 13.7 μm region. The upper panel shows the fit using two C2H2 slab models with optically thick (dark brown) and thin (light brown) emission. Two peaks at 13.695 μm and 13.732 μm associated with 13CCH2 can be clearly distinguished. The lower panel shows the best fit when using just one slab model (T = 325 K, N = 3.1 × 1018 cm−2, and R = 0.07 au).
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