1. Dept. Física de la Tierra y Astrofísica, Facultad de Ciencias Físicas, Instituto de Física de Partículas y del Cosmos, Universidad Complutense de Madrid, Plaza de las Ciencias 1, Madrid E-28040, Spain
2. Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
3. University of California, Santa Cruz, CA 95064, USA
4. Institut für Theoretische Astrophysik, Zentrum für Astronomie, Universität Heidelberg, Albert-Ueberle-Str. 2, D-69120 Heidelberg, Germany
5. New York University Abu Dhabi, PO Box 129188 Saadiyat Island, Abu Dhabi, United Arab Emirates
6. Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
7. Department of Astronomy and Astrophysics, UCO/Lick Observatory, University of California, 1156 High Street, Santa Cruz, CA 95064, USA
8. Kavli Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, Chiba 277-8583, Japan
9. Department of Physics and Astronomy and CIERA, Northwestern University, Evanston, IL 62563, USA