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This is the inaugural paper from the newly established Robert M. Walker Laboratory for Space Science at Astromaterials Research and Exploration Science, NASA Johnson Space Center. This research was supported by NASA Cosmochemistry grants to S.M., L.P.K., and D.S.L. This work was enabled by the NanoSIMS ion microprobe designed by G. Slodzian. We thank A. Heger and S. Woosley for generously sharing unpublished supernova model data. The revision of this paper benefited from careful reviews by two anonymous reviewers.
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