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tokens: This work was supported in part by NASA-ADAP grant NNX12AI49G and NSF grant 1411773. This research made use of Astropy 16 16 astropy.org (Astropy Collaboration et al. 2013 ), TOPCAT, 17 17 www.star.bris.ac.uk/∼mbt/topcat (Taylor 2005 ), and STILTS 18 18 www.star.bris.ac.uk/∼mbt/stilts (Taylor 2006 ). All figures made use of matplotlib 19 19 matplotlib.org (Hunter et al. 2007 ). Figures 1 , 3 , 8 , 11 , and 20 were made using densityplot 20 20 github.com/CKrawczyk/densityplot (Krawczyk Peters 2014 ). Special thanks go to Alex Gray for developing the code for the NBC KDE algorithm and to Erica Smith for carefully reviewing the manuscript. Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England. The SDSS website is http://www.sdss.org/ . 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 website is http://www.sdss3.org/ .