¹⁴N/¹⁵N from (68 × H¹³CN)/HC¹⁵N at different evolutionary stages, from cores to protoplanetary disks. Measures from comets, Earth, and Jupiter are also considered. Light blue dots represent our results using the ¹²C/¹³C derived from DNC/DN¹³C instead of the fixed ratio of 68. Dashed lines show the average values of each state. The local ISM value of ~330 (Hily-Blant et al. 2019) is represented with pink dashed lines. References: (1) Navarro-Almaida et al. (2023); (2) Jensen et al. (2024); (3) Yoshida et al. (2019); (4) Wampfler et al. (2014); (5) Guzmán et al. (2017); (6) Bockelée-Morvan et al. (2008); (7) Fouchet et al. (2004); (8) Owen et al. (2001).