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Fig. B.1
C2H column densities as a function of the disc radius obtained with DALI for a 10−2 M⊙ disc. Volatile C abundance is reduced by two orders of magnitude and O abundance is decreased by the same value or more in order to obtain [C]/[O] ratios of 0.3 (orange line), 0.8 (light green line), 1.0 (green line) and 1.5 (blue line).
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