finley@physics.columbia.edu westerhoff@nevis.columbia.edu gf25@nyu.edu

¹ Department of Physics and High Energy Astrophysics Institute, University of Utah, Salt Lake City, UT 84112
² Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545
³ Department of Physics, University of Adelaide, Adelaide, SA 5005, Australia
⁴ Department of Physics and Astronomy, University of Montana, Missoula, MT 59812
⁵ Department of Physics and Nevis Laboratories, Columbia University, New York, NY 10027
⁶ Department of Physics and Astronomy, Rutgers, State University of New Jersey, Piscataway, NJ 08854
⁷ Center for Cosmology and Particle Physics, Department of Physics, New York University, New York, NY 10003
⁸ University of Tokyo, Institute for Cosmic Ray Research, Kashiwa City, Chiba 277-8582, Japan
⁹ Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131