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Physikalisches Institut, RWTH Aachen University, D-52056 Aachen, Germany bDepartment of Physics, University of Adelaide, Adelaide, 5005, Australia cDept. of Physics and Astronomy, University of Alaska Anchorage, 3211 Providence Dr., Anchorage, AK 99508, USA dDept. of Physics, University of Texas at Arlington, 502 Yates St., Science Hall Rm 108, Box 19059, Arlington, TX 76019, USA eCTSPS, Clark-Atlanta University, Atlanta, GA 30314, USA fSchool of Physics and Center for Relativistic Astrophysics, Georgia Institute of Technology, Atlanta, GA 30332, USA gDept. of Physics, Southern University, Baton Rouge, LA 70813, USA hDept. of Physics, University of California, Berkeley, CA 94720, USA iLawrence Berkeley National Laboratory, Berkeley, CA 94720, USA jInstitut für Physik, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany kFakultät für Physik & Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, Germany lUniversité Libre de Bruxelles, Science Faculty CP230, B-1050 Brussels, Belgium mVrije Universiteit Brussel (VUB), Dienst ELEM, B-1050 Brussels, Belgium nDepartment of Physics and Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge, MA 02138, USA oDept. of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA pDept. of Physics and Institute for Global Prominent Research, Chiba University, Chiba 263-8522, Japan qDepartment of Physics, Loyola University Chicago, Chicago, IL 60660, USA rDept. of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand sDept. of Physics, University of Maryland, College Park, MD 20742, USA tDept. of Astronomy, Ohio State University, Columbus, OH 43210, USA uDept. of Physics and Center for Cosmology and Astro-Particle Physics, Ohio State University, Columbus, OH 43210, USA vNiels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark wDept. of Physics, TU Dortmund University, D-44221 Dortmund, Germany xDept. of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA yDept. of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2E1 zErlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany aaPhysik-department, Technische Universität München, D-85748 Garching, Germany abDépartement de physique nucléaire et corpusculaire, Université de Genève, CH-1211 Genève, Switzerland acDept. of Physics and Astronomy, University of Gent, B-9000 Gent, Belgium adDept. of Physics and Astronomy, University of California, Irvine, CA 92697, USA aeKarlsruhe Institute of Technology, Institute for Astroparticle Physics, D-76021 Karlsruhe, Germany afDept. of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA agSNOLAB, 1039 Regional Road 24, Creighton Mine 9, Lively, ON, Canada P3Y 1N2 ahDepartment of Physics and Astronomy, UCLA, Los Angeles, CA 90095, USA aiDepartment of Physics, Mercer University, Macon, GA 31207-0001, USA ajDept. of Astronomy, University of Wisconsin–Madison, Madison, WI 53706, USA akDept. of Physics and Wisconsin IceCube Particle Astrophysics Center, University of Wisconsin–Madison, Madison, WI 53706, USA alInstitute of Physics, University of Mainz, Staudinger Weg 7, D-55099 Mainz, Germany 2 amDepartment of Physics, Marquette University, Milwaukee, WI, 53201, USA anInstitut für Kernphysik, Westfälische Wilhelms-Universität Münster, D-48149 Münster, Germany aoBartol Research Institute and Dept. of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA apDept. of Physics, Yale University, New Haven, CT 06520, USA aqDept. of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK arDept. of Physics, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USA asPhysics Department, South Dakota School of Mines and Technology, Rapid City, SD 57701, USA atDept. of Physics, University of Wisconsin, River Falls, WI 54022, USA auDept. of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA avOskar Klein Centre and Dept. of Physics, Stockholm University, SE-10691 Stockholm, Sweden awDept. of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800, USA axDept.