Fig. 8

Column densities of N-bearing species with respect to HNCO as derived from HN13 CO. 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; Calcutt et al. 2018), NGC 1333 IRAS 4A2 (López-Sepulcre et al. 2017), and AFGL 4176 (Bøgelund et al. 2019a).
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