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Table 6

12C/13C ratios predicted for HNC and HCN in the range of temperatures and densities of the high-mass star-forming regions sample observed by Colzi et al. (2018a) (Cols. 2 and 3).

Time R1/68 R2/68
t1 74–135 68–121 1.1–1.9 1–1.8
t2 68–97 52–96 1–1.4 0.8–1.4
t3 53–240 52–210 0.8–3.5 0.8–3.1

Notes. The fourth and fifth columns present the error factor made when deriving 14 N/15N ratios assuming alocal 12C/13C ratio of 68.

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