1. Institute of Cosmology and Gravitation, University of Portsmouth, Burnaby Road, Portsmouth PO1 3FX, UK
2. School of Mathematics and Physics, University of Portsmouth, Lion Gate Building, Portsmouth PO1 3HF, UK
3. Department of Physics and Astronomy, University of Kentucky, 505 Rose Street, Lexington, KY 40506-0055, USA
4. Center for Astro, Particle and Planetary Physics, New York University Abu Dhabi, Abu Dhabi P.O. Box 129188, United Arab Emirates
5. Sub-Department of Astrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
6. Department of Astronomy, New Mexico State University, Las Cruces, NM 88003, USA
7. Observatório Nacional/MCTIC, R. Gen. José Cristino, 77, 20921-400 Rio de Janeiro, Brazil
8. Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065, USA
9. Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences, University of Colorado, 389 UCB, Boulder, CO 80309-0389, USA
10. Apache Point Observatory and New Mexico State University, P.O. Box 59, Sunspot, NM 88349, USA
11. Sternberg Astronomical Institute, Moscow State University, Universitetskij pr. 13, Moscow 19992, Russia
12. Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USA
13. Vanderbilt University Physics and Astronomy Department, 6301 Stevenson Center Ln. Nashville, TN 37235, USA
14. McDonald Observatory, The University of Texas at Austin, 1 University Station, Austin, TX 78712, USA
15. School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
16. Department of Physics and JINA Center for the Evolution of the Elements, University of Notre Dame, Notre Dame, IN 46556, USA