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. Author manuscript; available in PMC: 2019 Apr 1.
Published in final edited form as: Geochim Cosmochim Acta. 2018 Feb 10;226:107–131. doi: 10.1016/j.gca.2018.01.038

Figure 7.

Figure 7

Histograms of O isotopic ratios measured in presolar oxide and silicate grains (see Figure 6 for data sources). Top: Previously reported data for silicates and oxides are compared; presolar silicates show a narrower distribution of 17O/16O and 18O/16O ratios than presolar oxide grains, reflecting isotope dilution in in situ SIMS analyses. Bottom: Data for 101 DOM 08006 presolar grains compared to the previous silicate data (re-scaled to fit on plots). The DOM 08006 data span narrower ranges of O-isotope ratios, most likely reflecting both the limited statistics as well as a conservative choice for identifying grains in ion images (see text).