Graphs of the distribution of isotopic values measured in the residues OR4 (blue), OR5 (orange), OR6 (pink), OR7 (red), and OR8 (green). (a): ¹⁵N/¹⁴N against ¹³C/¹²C. (b): ¹⁵N/¹⁴N against D/H. Residues OR4, OR5, and OR6 were formed during the 2020 session and residues OR7 and OR8 during the 2021 session. Residues formed during the same session experienced the same conditions, that is, they formed on the same substrate, irradiated with the same ions, and experienced the same annealing.