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Fig. 5
Observed CH3OH spectra (blue) towards the 10 sources that show continuum emission, superimposed on the predicted CH3OH spectrum (red) for a column density of 2.5 × 1015 cm−2, ~4 orders of magnitude below the value from the Class 0 source IRAS 16293-2422 (Jørgensen et al. 2016).
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