[1] Univ Adelaide, Dept Phys, Adelaide, SA 5005, Australia
[2] Tech Univ Munich, Phys Dept, D-85748 Garching, Germany
[3] DESY, D-15735 Zeuthen, Germany
[4] Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch, New Zealand
[5] Univ Libre Bruxelles, Sci Fac CP230, B-1050 Brussels, Belgium
[6] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[7] Univ Wisconsin, Wisconsin IceCube Particle Astrophys Ctr, Madison, WI 53706 USA
[8] Stockholm Univ, Oskar Klein Ctr, SE-10691 Stockholm, Sweden
[9] Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden
[10] Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, D-91058 Erlangen, Germany
[11] Marquette Univ, Dept Phys, Milwaukee, WI 53201 USA
[12] Penn State Univ, Dept Phys, University Pk, PA 16802 USA
[13] Johannes Gutenberg Univ Mainz, Inst Phys, Staudinger Weg 7, D-55099 Mainz, Germany
[14] MIT, Dept Phys, Cambridge, MA 02139 USA
[15] Rhein Westfal TH Aachen, Phys Inst 3, D-52056 Aachen, Germany
[16] South Dakota Sch Mines & Technol, Phys Dept, Rapid City, SD 57701 USA
[17] Columbia Univ, Columbia Astrophys & Nevis Labs, New York, NY 10027 USA
[18] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[19] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[20] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[21] Ohio State Univ, Dept Phys & Ctr Cosmol & Astro Particle Phys, Columbus, OH 43210 USA
[22] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA
[23] Ruhr Univ Bochum, Fak Phys & Astron, D-44780 Bochum, Germany
[24] Univ Wuppertal, Dept Phys, D-42119 Wuppertal, Germany
[25] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA
[26] Natl Res Nucl Univ, MEPhI Moscow Engn Phys Inst, Moscow, Russia
[27] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[28] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA
[29] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[30] Uppsala Univ, Dept Phys & Astron, SE-75120 Uppsala, Sweden
[31] TU Dortmund Univ, Dept Phys, D-44221 Dortmund, Germany
[32] Sungkyunkwan Univ, Dept Phys, Suwon 440746, South Korea
[33] Vrije Univ Brussel, Dienst ELEM, B-1050 Brussels, Belgium
[34] Univ Geneva, Dept Phys Nucl & Corpusculaire, CH-1211 Geneva, Switzerland
[35] Univ Toronto, Dept Phys, Toronto, ON M5S IA7, Canada
[36] Westfalische Wilhelms Univ Munster, Inst Kernphys, D-48149 Munster, Germany
[37] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA
[38] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
[39] Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA
[40] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
[41] Univ Ghent, Dept Phys & Astron, B-9000 Ghent, Belgium
[42] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany
[43] Univ Manchester, Sch Phys & Astron, Oxford Rd, Oxford M13 9PL, England
[44] Southern Univ, Dept Phys, Baton Rouge, LA 70813 USA
[45] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
[46] Univ Alberta, Dept Phys, Edmonton, AB T6G 2E1, Canada
[47] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark
[48] Univ Tokyo, Earthquake Res Inst, Tokyo 1130032, Japan
[49] Chiba Univ, Dept Phys, Chiba 2638522, Japan
[50] Clark Atlanta Univ, CTSPS, Atlanta, GA 30314 USA