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. Author manuscript; available in PMC: 2021 Jul 26.
Published in final edited form as: Geochim Cosmochim Acta. 2021 Mar 10;301:70–90. doi: 10.1016/j.gca.2021.03.004

Fig. 2.

Fig. 2.

Oxygen-isotope compositions of CO, CM, anomalous CM (CM-an), and C2-ungrouped (C2-ung) chondrites reported previously (Clayton and Mayeda, 1999; Greenwood and Franchi, 2004; Haack et al., 2012; Hewins et al., 2014; Jacquet et al., 2016; Lee et al., 2016, 2019; Alexander et al., 2018; Kimura et al., 2020); the data for the highly primitive CM chondrites, Asuka 12085, 12169, and 12236, are highlighted as the gray squares while all other CM data are shown as the blue squares. The terrestrial fractionation line (TFL; Clayton et al., 1973) and the line defining carbonaceous chondrite anhydrous minerals (CCAM; Clayton and Mayeda, 1977) are shown for reference. Arrows indicate three samples (GRO 95566, MAC 88107, and NWA 5958) included in the present study for which O-isotope compositions have been previously reported.