Fig. A.1
UCAMM nitrogen abundances relative to carbon (atomic ratio) are compared to solar system solids: meteorites (Alexander et al. 2007; Kerridge 1985), the bulk silicate Earth (BSE, Bergin et al. 2015), and the interstellar medium (see text for details). The sizes of the symbols for UCAMMs and meteorites give the absolute nitrogen content (in wt %). UCAMM values are reported in Table B.1.
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