1. Leibniz-Institut für Astrophysik Potsdam , An der Sternwarte 16, D-14482 Potsdam, Germany
2. School of Physics and Astronomy, University of Nottingham , University Park, Nottingham NG7 2RD, UK
3. Max-Planck-Institut für Astronomie , Königstuhl 17, D-69117 Heidelberg, Germany
4. Tata Institute of Fundamental Research , Homi Bhabha Road, Mumbai 400005, India
5. Kavli Institute for Cosmology and Institute of Astronomy , Madingley Road, Cambridge CB3 0HA, UK
6. SISSA − International School for Advanced Studies , Via Bonomea 265, I-34136 Trieste, Italy
7. IFPU, Institute for Fundamental Physics of the Universe , Via Beirut 2, I-34151 Trieste, Italy
8. INFN , Sezione di Trieste, Via Valerio 2, I-34127 Trieste, Italy
9. INAF − Osservatorio Astronomico di Trieste , Via G. B. Tiepolo 11, I-34143 Trieste, Italy
10. Observatoire Astronomique de Strasbourg , 11 rue de l’Universite, F-67000 Strasbourg, France
11. Department of Physics and Astronomy , Riverside, CA 92521, USA
12. , University of California , Riverside, CA 92521, USA
13. Institute for Astronomy , Blackford Hill, Edinburgh EH9 3HJ, UK
14. , University of Edinburgh , Blackford Hill, Edinburgh EH9 3HJ, UK