1. Department of Physics, ETH Zurich, HPF G 9.3, Otto-Stern-Weg 1, CH-8093 Zurich, Switzerland
2. Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany
3. Subaru Telescope, National Astronomical Observatory of Japan, National Institutes of Natural Sciences (NINS), 650 North A’ohoku Place, Hilo, HI 96720, USA
4. Department of Astronomical Science, SOKENDAI (The Graduate University for Advanced Studies), 650 North A'ohoku Place, Hilo, HI, 96720, USA
5. Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands
6. Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, P-PT4150-762 Porto, Portugal
7. Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38205 La Laguna, Spain
8. Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Santa Cruz de Tenerife, Spain
9. Department of Physics and Astronomy, University of Victoria, PO Box 1700 STN CSC, Victoria BC V8W 2Y2, Canada
10. Astronomy Centre, Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, East Sussex, UK
11. Jeremiah Horrocks Institute, University of Central Lancashire, Fylde Rd, Preston PR1 2HE, Lancashire, UK
12. Univ Lyon, Univ Lyon1, Ens de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon UMR5574, F-69230 Saint-Genis-Laval, France
13. Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138, USA