| Affiliation: |
| AA(Harvard-Smithsonian Center for Astrophysics Cambridge, MA 02138, USA ), AB(Harvard-Smithsonian Center for Astrophysics Cambridge, MA 02138, USA), AC(University of Illinois at Urbana-Champaign, Urbana, IL 61801), AD(South African Astronomical Observatory, South Africa), AE(Department of Astronomy, University of Washington, Seattle, WA 98195), AF(Department of Astronomy, Seoul National University, Seoul, Korea), AG(Department of Phys. & Astron., University of Texas, San Antonio, TX, USA), AH(Max-Planck-Institut fur extraterrestrische Physik, Garching 85748, Germany) |