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tokens: We thank the referee for suggestions that improved the manuscript, and Jeremy Darling, Jason Glenn, Serena Criscuoli, and Mihály Horányi for thoughtful guidance on the methodology and analysis. Facility: Apache Point Observatory (TripleSpec) . Software: Astropy (Robitaille et al. 2013 ), IPython (Perez Granger 2007 ), Matplotlib (Hunter 2007 ), molecular-hydrogen ( https://github.com/keflavich/molecular_hydrogen ), NumPy and SciPy (van der Walt et al. 2011 ).