Fig. 3

Ratio between the column densities of SO, CS, and H2S observed in the four protoplanetary disks at 300 AU from the central star and the values computed with NAUTILUS. For SO and H2S, they correspond to upper limits. The four Models (A, B, C, and D) correspond to the elemental abundances given in Table 4 and to the parameters given in Table 5.
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