Fig. 7.
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Ratio of the S(2)/S(7) H2 emission lines in different low-mass protostellar sources. Red points mark Class 0 sources from Francis et al. (2025) and blue points are Class I sources from this work and TMC1-E from Tychoniec et al. (2024). The dashed lines mark the median values, 0.3 for Class 0 (in red) and 1.0 (in blue). Colored areas mark the median ± standard deviation range.
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