Fig. 4

Modeled column densities for SO (diamond), H2S (cross) and CS (star) for the four sources in the case of Model C (C/O = 1.2, initial cloud H density of 2 × 105 cm-3 and age of 106 yr). The observed column densities have been reported in grey (or color). Top panel: MWC480, medium panel: LkCa15, bottom panel: GO Tau and DM Tau (same model).
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