Coleman M. Krawczyk, Gordon T. Richards, S. C. Gallagher, Karen M. Leighly, Paul C. Hewett, Nicholas P. Ross, and P. B. Hall 1 Department of Physics, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USA 2 Institute for Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth, PO1 3FX, UK Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany 4 Department of Physics & Astronomy, The University of Western Ontario, London, ON N6A 3K7, Canada 5 Yale Center for Astronomy and Astrophysics, Yale University, P.O. Box 208120, New Haven, CT 06520, USA 6 Homer L. Dodge Department of Physics and Astronomy, The University of Oklahoma, 440 W. Brooks Street, Norman, OK 73019, USA 7 Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK 8 Department of Physics and Astronomy, York University, Toronto, ON M3J 1P3, Canada Received 2015 August 11; published 2016 January 14