Fig. 11
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SiO column density, N(SiO), as a function of molecular hydrogen column density, N(H2). Dotted lines correspond to SiO abundances, X(SiO), with respect to N(H2). Red triangles correspond to helix stream, blue dots represent data from Csengeri et al. (2016), magenta crosses from Zhu et al. (2020) and green squares correspond to data from Kim et al. (2023).
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