1. School of Physics and Astronomy, University of Southampton , Highfield, Southampton SO17 1BJ , UK
2. INAF – Astronomical Observatory of Trieste , via G.B. Tiepolo 11, I-34143 Trieste , Italy
3. IFPU – Institute for Fundamental Physics of the Universe , via Beirut 2, I-34151 Trieste , Italy
4. INAF – Osservatorio Astronomico di Roma , via Frascati 33, I-00078 Monteporzio , Italy
5. Astronomy Unit, Department of Physics, University of Trieste , via Tiepolo 11, I-34131 Trieste , Italy
6. Fakultat fur Physik , Universitats-Sternwarte Munchen, LMU Munich, Scheinerstr. 1, D-81679 Munchen , Germany
7. Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse , D-85741 Garching , Germany
8. Institute for Astronomy and Astrophysics, National Observatory of Athens , Athens, V. Paulou & I. Metaxa, 11532 , Greece
9. Centre for Extragalactic Astronomy, Department of Physics, Durham University , Durham , UK
10. Scuola Internazionale Superiore Studi Avanzati (SISSA), Physics Area , Via Bonomea 265, I-34136 Trieste, Scuola Internazionale Superiore Studi Avanzati (SISSA), Physics Area Italy
11. Institute for Physics, Laboratory for galaxy Evolution and Spectral Modelling, EPFL, Observatoire de Sauverny , Chemin Pegasi 51, CH-1290 Versoix , Switzerland
12. INAF – Osservatorio Astronomico di Capodimonte , Via Moiariello 16, I-80131 Napoli , Italy
13. Donostia International Physics Center , Paseo Manuel de Lardizabal 4, E-20118 Donostia-San Sebastián , Spain
14. Ikerbasque , Basque Foundation for Science, E-48013 Bilbao , Spain
15. Departimento di Fisica e Astronomia ‘Augusto Righi’, Universita di Bologna , Via Gobetti 93/2, I-40129 Bologna , Italy
16. INAF – Osservatorio di Astrofisica e Scienza dello Spazio di Bologna , Via Gobetti 93/3, I-40129 Bologna , Italy
17. Department of Physics and Astronomy, University of California , Los Angeles, CA 90095 , USA
18. DARK, Niels Bohr Institute, University of Copenhagen , Jagtvej 155, Copenhagen N, DK-2200 , Denmark
19. Instituto de Astrofísica de Canarias, Calle Vía Láctea , s/n, E-38205, La Laguna, Tenerife , Spain
20. Departamento de Astrofísica , Universidad de La Laguna, E-38206, La Laguna, Tenerife , Spain