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tokens: We thank the anonymous referee for helpful comments. We thank the staff of the Keck Observatory for their help in obtaining the observations presented herein. Support for this work at UCLA was provided by the Kaplan Family Student Support Fund and the W. M. Keck Foundation. The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. 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. Facility: Keck:II (NIRC2). Software: NumPy (van der Walt et al. 2011 ), Astropy (Astropy Collaboration et al. 2013 ), emcee (Foreman-Mackey et al. 2013 ), SciPy (Jones et al. 2001 ), Matplotlib (Hunter 2007 ).