Extended Data Fig. 2: δ15N of iron meteorites plotted against their N abundances.
From: A very early origin of isotopically distinct nitrogen in inner Solar System protoplanets
For each iron meteorite group, δ15N falls in a narrow range, while N contents may vary over two orders of magnitude. Lack of any relationship between δ15N values and N abundances within any given group of iron meteorites argues against notable mass-dependent fractionation of N isotopes via volatility-related losses during planetary processing19,20,44.
