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Fig. 8
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Abundance ratios of SO2/CCS (red) and SO/CS (purple) in several sources and in L1551 IRS 5. The ratios for TMC-1, L1544, L483 and B1-b are taken from Agúndez et al. (2019), B335 from Esplugues et al. (2023), and the value for L1455 IRS 1 is taken from Mercimek et al. (2022).
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