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Fig. 2
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Relationship between the HCS+ and H2S abundances (a), H2CS and H2S abundances (b), and HCS+ and H2CS abundances (c), all normalized by H2. The fitting lines, generated using the least square method, are marked in red. G011.49-01.48 and G0168.06+00.82, which have large errors, are marked where H234S lines show weak emission.
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