tokens: We thank everyone who offered their help to this work, including Matthew Miller, Edmund Hodges-Kluck, Zhijie Qu, and our anonymous referee, whose comments helped to improve this work. Special thanks also go to Eric Peng for the computational resources he provided. This research is funded by the China Scholarship Council, NASA ADAP grant NNX16AF23G, and the Department of Astronomy at the University of Michigan, who we also thank for their hospitality. Software: AtomDB (Foster et al. 2012 ), emcee (Foreman-Mackey et al. 2013 ).
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