Fig. 12
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Observational sulphur molecular ratios of potentially good chemical evolution tracers of the prestellar to protostellar transition for different objects (TMC1, L 1544, B 335, L 483, and B1-b). Data for TMC1 were taken from Marcelino et al. (2007), Cernicharo (2012), Cernicharo et al. (2021), and Rodríguez-Baras et al. (2021). Data for L 1544 were taken from Vastel et al. (2018). L 483 and B1-b data were gathered from Agúndez et al. (2019) and Fuente et al. (2016), respectively.
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