1. Department of Physics and Astronomy, University of California, Los Angeles, 430 Portola Plaza, Los Angeles, CA 90095, USA
2. Department of Physics, University of California, Davis, 1 Shields Avenue, Davis, CA 95616, USA
3. Department of Physics and Astronomy, University of California, Riverside, 900 University Avenue, Riverside, CA 92521, USA
4. Astronomy Department, University of California, Berkeley, CA 94720, USA
5. Center for Astrophysics and Space Sciences, Department of Physics, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
6. Steward Observatory, University of Arizona, 933 N Cherry Ave, Tucson, AZ 85721, USA
7. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
8. Max-Planck-Institut für Extraterrestrische Physik, Postfach 1312, D-85741 Garching, Germany
9. Department of Physics, The College of Wooster, 1189 Beall Avenue, Wooster, OH 44691, USA
10. Department of Phyics, University of the Pacific, 3601 Pacific Ave, Stockton, CA 95211, USA