1. School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
2. Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK
3. Department of Physics & Astronomy, University of Canterbury, Christchurch 8041, New Zealand
4. School of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3AA, UK
5. Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão, 1226, Cidade Universitária São Paulo, São Paulo 05508-090, Brazil
6. Inst. de Fisica de Cantabria (CSIC-UC), Avda. los Castros s/n, E-39005 Santander, Spain
7. Centre for Astrophysics, Science & Technology Research Institute, University of Hertfordshire, Hatfield, Herts AL10 9AB, UK
8. INAF–Osservatorio Astronomico di Padova, Vicolo Osservatorio 5, I-35122 Padova, Italy
9. 9SISSA, Via Bonomea 265, I-34136 Trieste, Italy
10. ESO, Karl Schwarzschild Strasse 2, D-85748 Garching, Germany
11. (SUPA) School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, UK