1. Center for Cosmology, Department of Physics and Astronomy, 4129 Reines Hall, University of California, Irvine, CA 92697, USA
2. Department of Astronomy, University of Maryland, College Park, MD 20742, USA
3. Service d'Astrophysique, DAPNIA, CEA/Saclay, F-91191 Gif-sur-Yvette Cedex, France
4. LERMA, Observatoire de Paris, CNRS, UPMC, PSL Univ., and College de France, F-75014 Paris, France
5. Observatorio Astronómico Nacional (OAN-IGN)-Observatorio de Madrid, Alfonso XII, 3, E-28014 Madrid, Spain
6. Max-Planck-Institut für Extraterrestrische Physik (MPE), Giessenbachstr., D-85748 Garching, Germany
7. Department of Physics, Le Conte Hall, University of California, Berkeley, CA 94720, USA
8. Department of Astronomy, Campbell Hall, University of California, Berkeley, CA 94720, USA
9. IRAM, 300 Rue de la Piscine, F-38406 St Martin d'Heres, Grenoble, France
10. Center for Astrophysics and Space Sciences, Department of Physics, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
11. Steward Observatory, 933 North Cherry Avenue, University of Arizona, Tucson, AZ 85721, USA
12. Max Planck Institut für Radioastronomie (MPIfR), Auf dem Hügel 69, D-53121 Bonn, Germany