1. Astrophysics Research Institute, Liverpool John Moores University , IC2 Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF, UK
2. Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal , 4, E-20018, Donostia-San Sebastián, Guipuzkoa, Spain
3. IKERBASQUE, Basque Foundation for Science , E-48013, Bilbao, Spain
4. Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University , 2145 Sheridan Road, Evanston, IL 60208, USA
5. The Oskar Klein Centre, Department of Astronomy, Stockholm University , AlbaNova, SE-10691 Stockholm, Sweden
6. ESO, European Southern Observatory , Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany
7. Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg , Mönchhofstraße 12-14, D-69120 Heidelberg, Germany
8. Max Planck Institute for Astrophysics , Karl-Schwarzschild-Straße 1, D-85748 Garching, Germany
9. Anton Pannekoek Institute for Astronomy, University of Amsterdam , Science Park 904, NL-1098XH Amsterdam, the Netherlands
10. Department of Astronomy, University of Geneva , Chemin des Maillettes 51, CH-1290 Versoix, Switzerland
11. Department of Astrophysics/IMAPP, Radboud University , P.O. Box 9010, NL-6500 GL Nijmegen, the Netherlands
12. Research School of Astronomy and Astrophysics, Australian National University , Canberra, ACT 0200, Australia
13. Leibniz-Institute for Astrophysics , An der Sternwarte 16, D-14482 Potsdam, Germany
14. Department of Physics and Astronomy, Johns Hopkins University , 3400 North Charles Street, Baltimore, MD 21218, USA