tokens: ACKNOWLEDGEMENTS We thank the anonymous referee for insightful comments. We acknowledge support from NSF AST 16-15688, the NASA/NY Space Grant fellowship, and contributions made by The Marvin Clan, Babette Josephs, Manit Limlamai, and the 2015 Crowd Funding Campaign to Support Milky Way Research. JLC acknowledges support from AST 11-51462. TCB acknowledges partial support for this work from grant PHY 14-30152; Physics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE), awarded by the US National Science Foundation. PD acknowledges partial funding from a Natural Sciences and Engineering Research Council of Canada grant to D. VandenBerg. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the US Department of Energy Office of Science. The SDSS-III Website is http://www.sdss3.org/ .
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