Fig. 8
Left: silicates-to-aromatic C=C integrated area ratio and corresponding silicon-to-carbon atomic ratio (right axis, see text for details) in UCAMMs. Right: UCAMMs (stars) carbon abundances relative to silicon (atomic ratio) are compared to solar system solids: IDPs (Matrajt et al. 2005b; Thomas et al. 1993, triangles and diamonds, respectively), meteorites (Kerridge 1985, circles), the bulk silicate Earth (BSE, Bergin et al. 2015, cross), and the interstellar medium (square, see text for details).
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