tokens: Acknowledgements We thank our referee, Ulrike Heiter, for providing constructive feedback that improved the content and clarity of this manuscript. This work has made use of the VALD data base, operated at Uppsala University, the Institute of Astronomy RAS in Moscow and the University of Vienna. This research made use of Astropy, a community-developed core python package for Astronomy (Astropy Collaboration 2013 ). This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France. The original description of the VizieR service was published in AAS 143, 23. We acknowledge support from NSF-AST 1009314 (E.R., J.W.) and NASA Origins of Solar System program under NNX13AK17G (J.W.).
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