Fig. 4
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Comparison of H2S deuterium fraction, HDS/H2S, in starless cores (blue) and protostellar sources (red). The bar pattern indicates the direct detection (solid) or determination of upper limits (dashed) of the HDS emission. The starless cores’ dataset is colour-coded according to the method applied for the estimation of the H2S abundance, as shown in the legend. References: Starless cores: This work. B1b: This work. IRAS 16293: van Dishoeck et al. (1995). G10.47+0.03, G31.41+0.31 and G34.26+0.15: Hatchell et al. (1999). Orion KL: Crockett et al. (2014).
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