Open Access
Fig. 1
Published nitrogen isotopic ratios for HCN and HNC toward prestellar cores (PSCs) and protostellar envelopes. DG2013 is Daniel et al. (2013), WA2014 is Wampfler et al. (2014), IH2002 is Ikeda et al. (2002), and HB2013a is Hily-Blant et al. (2013a).
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