Fractionation in young cores: Direct determinations of nitrogen and carbon fractionation in HCN S. S. Jensen, S. Spezzano, P. Caselli, O. Sipilä, E. Redaelli, K. Giers and J. Ferrer Asensio A&A, 685 (2024) A149 Published online: 17 May 2024 DOI: 10.1051/0004-6361/202449344