^a Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
^b Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
^c Physics Department, University of California, Berkeley and Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
^d W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, USA
^e Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA
^f Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
^g Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, Japan 277-8568
^h Physics Department, Drexel University, Philadelphia, Pennsylvania 19104, USA
ⁱ Department of Physics and Astronomy, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
^j Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA
^k Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
^l Physics Department, Stanford University, Stanford, California 94305, USA
^m Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
ⁿ Triangle Universities Nuclear Laboratory: Physics Departments at Duke University, North Carolina Central University and the University of North Carolina at Chapel Hill Durham, North Carolina 27708, USA
^o CEN Bordeaux-Gradignan, IN2P3-CNRS and University Bordeaux I, F-33175 Gradignan Cedex, France