1. INAF – Osservatorio Astronomico di Capodimonte, Salita Moiariello, 16, I-80131 Napoli, Italy
2. European Southern Observatory, Karl-Schwarzschild-Straße 2, D-85748 Garching bei Munchen, Germany
3. INAF – Astronomical Observatory of Abruzzo, Via Maggini, I-64100 Teramo, Italy
4. Kapteyn Astronomical Institute, University of Groningen, PO Box 800, NL-9700 AV Groningen, the Netherlands
5. INFN, Sezione di Napoli, via Cintia, I-80126 Napoli, Italy
6. Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA
7. Dipartimento di Fisica Ettore Pancini, Università di Napoli Federico II,via Cintia, I-80126 Napoli, Italy
8. Astronomy and Astrophysics Department, University of California at Santa Cruz, CA 95064, USA
9. Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK
10. Astronomisches Rechen-Institut Zentrum für Astronomie Mönchhofstraße 12-14, D-69120 Heidelberg, Germany
11. CASSACA, Camino El Observatorio 1515, Las Condes, Santiago, Chile
12. UK Astronomy Technology Centre, Royal Observatory Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK
13. Gemini Observatory, Northern Operations Center, 670 North A’ohoku Place, Hilo, HI 96720, USA
14. Pontificia Universidad Catolica de Chile, Av. Vicuna Mackenna 4860, Santiago, Chile