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. 2021 Apr 21;7(17):eabg9707. doi: 10.1126/sciadv.abg9707

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Fig. 4 — During the evolution of the early solar system, nebular accretion rate, Ṁ, decreased with time and the distances of the SLs from the Sun decreased. A possible region of SMPB formation is bounded by CO₂ and CO SLs and the ice-depleted region.