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Radial C2H profiles (in blue) of the disks in the Bergner sample plus TW Hya (Bergin et al. 2016) and PDS 70 (Facchini et al. 2021). The gray indicates the uncertainty. The CO snow line (in the 22-30 K range) is overplotted as in Fig. A.2. The high-resolution continuum profiles of Fig. A.2 are overplotted in black to show that the C2H is always more extended than the continuum.
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