Author affiliations
1 Physics & Astronomy Department, Iowa State U., Ames, IA 50011, USA
2 Department of Physics, U. of Massachussetts, Amherst, MA 01003-4525, USA
3 Department of Physics, U. of Leeds, Leeds, LS2 9JT, Yorkshire, UK
4 Department of Physics, Washington U., St. Louis, MO 63130, USA
5 Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, USA
6 Department of Physics, U. of California, Los Angeles, CA 90095, USA
7 Physics Department, National U. of Ireland, Belfield, Dublin 4, Ireland
8 Department of Physics, Purdue U., West Lafayette, IN 47907, USA
9 Department of Physics, Grinnell College, Grinnell, IA 50112-1690, USA
10 Department of Astronomy and Astrophysics,Penn. State U., University Park, PA 16802, USA
11 Department of Physics and Astronomy, Barnard College, Columbia U., New York, NY 10027, USA
12 Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605, USA
13 F. Lawrence Whipple Observatory, Harvard-Smithsonian CfA, Amado, AZ 85645, USA
14 Physics Department, National U. of Ireland, Galway, Ireland
15 Physics Department, McGill U., Montreal, QC H3A 2T8, Canada
16 Department of Physics and Astronomy, U. of Delaware, Newark, DE 19716, USA
17 Enrico Fermi Institute, U. of Chicago, Chicago, IL 60637, USA
18 Department of Physics and Astronomy, U. of Iowa, Iowa City, IA 52242, USA
19 High Energy Astrophysics Inst., U. of Utah, Salt Lake City, UT 84112, USA
20 Department of Physical and Life Sciences, Galway-Mayo Institute of Technology, Dublin Road, Galway, Ireland
21 Santa Cruz Institute for Particle Physics and Department of Physics, U. of California, Santa Cruz, CA 95064, USA