Fig. 7
Column densities of the N-bearing molecules with respect to methanol for sources observed by ALMA. Column densities of methanol for B1-c and S68N are taken from van Gelder et al. (2020). Shown are IRAS 16293A (Coutens et al. 2016; Ligterink et al. 2017; Calcutt et al. 2018; Manigand et al. 2020), IRAS 16293B (Coutens et al. 2016, 2018; Ligterink et al. 2017; Jørgensen et al. 2018; Calcutt et al. 2018), HH 212 (Lee et al. 2019), AFGL 4176 (Bøgelund et al. 2019a), and NGC 6334 MM1, MM2, and MM3 (Bøgelund et al. 2019b).
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