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Fig. 8

C/O mass ratio in the gas phase for the disc #1 of A13 (Σ0 = 95.8 g cm-2, acore = 46 AU, γ = 0.9), plotted after 100, 50 000, 75 000, and 100 000 years of evolution. The plot is shown for CO/H2O = 0.2 and without irradiation.
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