anderson@astro.washington.edu

¹ Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA
² Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210-1173, USA
³ Princeton University Observatory, Princeton, NJ 08544, USA
⁴ Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104, USA
⁵ Department of Astronomy, University of California, Los Angeles, Los Angeles, CA 90095, USA
⁶ Department of Physics and Astronomy, Rutgers, the State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854, USA
⁷ Department of Astronomy, MSC 4500, New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003, USA
⁸ Kavli Institute for Cosmological Physics, The University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA
⁹ Center for Particle Astrophysics, Fermilab, P.O. Box 500, Batavia, IL 60510, USA
¹⁰ Physics Department, University of Notre Dame, 225 Nieuwland Science, Notre Dame, IN 46556-5670, USA
¹¹ Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349, USA
¹² Department of Physics, Rochester Institute of Technology, Rochester, NY 14623-5603, USA
¹³ Pennsylvania State University, Department of Physics & Astronomy, 525 Davey Lab, University Park, PA 16802, USA
¹⁴ Department of Astronomy and Astrophysics, The University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA
¹⁵ Enrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA