1. Department of Physics, University of Chicago, 5640 South Ellis Avenue, ERC 569, Chicago, IL 60637, USA
2. Sub-department of Astrophysics, University of Oxford, Keble Road, Oxford OX1 3RH, UK
3. Finnish Centre for Astronomy with ESO (FINCA), Quantum, Vesilinnantie 5, University of Turku, FI-20014 Turku, Finland
4. Department of Physics, University of Helsinki, PO Box 64, FI-00014 Helsinki, Finland
5. Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
6. Institut d’Astrophysique de Paris, Sorbonne Universités, UPMC Univ Paris 6 et CNRS, UMR 7095, 98 bis bd Arago, 75014 Paris, France
7. Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
8. Korea Institute for Advanced Study (KIAS), 85 Hoegiro, Dongdaemun-gu, Seoul 02455, Republic of Korea
9. Aix Marseille Université, CNRS, CNES, LAM, 38 rue F. Joliot Curie, F-13388, Marseille, France
10. Department of Physics and Astronomy, University of Hawaii at Hilo, 200 W. Kawili St, Hilo, HI 96720, USA
11. University of Chinese Academy of Sciences, Beijing 100049, China
12. Observatoire de la Côte d’Azur, Université Côte d’Azur, CNRS, Laboratoire Lagrange, Bd de l’Observatoire, CS 34229, F-06304 Nice Cedex 4, France