1. Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA.
2. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
3. Departments of Physics and Astronomy, University of California, Berkeley, CA 94720, USA.
4. DARK, Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen, Denmark.
5. The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA.
6. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA.
7. Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena, Chile.
8. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA.
9. Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA.
10. Departamento de Física y Astronomía, Facultad de Ciencias, Universidad de La Serena, Cisternas 1200, La Serena, Chile.