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tokens: Much of this work was in progress at the time of Steve Murray’s untimely death in 2015. This work would not have been possible without his generous GTO contribution to the XBoötes data set and his strong support of Boötes multiwavelength surveys. He will be greatly missed by all of us. We thank the referee for a careful reading and constructive suggestions that have improved the manuscript. C.-T.J.C. was supported by the William H. Neukom 1964 Institute for Computational Science. R.C.H. acknowledges support from the National Science Foundation through AST award no. 1515364 and from an Alfred P. Sloan Research Fellowship. R.J.A. was supported by FONDECYT grant no. 1151408. This publication makes use of data products from the Wide-field Infrared Survey Explorer , which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This publication also makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III Web site is http://www.sdss3.org/ .