tokens: We thank Nacho Martín-Navarro for comments on the manuscript, and the anonymous referee for an excellent and thorough report that improved the paper. Support from NASA grant NNX15AK14G, STScI grant GO-13681, and NSF grants AST-1313280, AST-1515084, AST-1518294, AST-1616598, and AST-1616710 is gratefully acknowledged. C.C. acknowledges support from the Packard Foundation. A.V. is supported by an NSF Graduate Research Fellowship. A.J.R. is supported as a Research Corporation for Science Advancement Cottrell Scholar. Based on data obtained with the W.M. Keck Observatory, on Maunakea, Hawaii. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.
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