1. INAF Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy
2. Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12-14, D-69120 Heidelberg, Germany
3. Departamento de Astronomía, Universidad de Chile, Camino El Observatorio 1515, Las Condes, 7591245 Santiago, Chile
4. Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, 8970117 Santiago, Chile
5. Millenium Institute of Astrophysics, Camino El Observatorio 1515, Las Condes, 7591245 Santiago, Chile. Santiago, Chile
6. LERMA, CNRS UMR 8112, PSL, Observatoire de Paris, 61 Avenue de l'Observatoire, F-75014 Paris, France
7. National Research Council of Canada, Herzberg Astronomy and Astrophysics Program, 5071 W. Saanich Road, Victoria V9E 2E7, BC, Canada
8. Astronomy Department, California Institute of Technology, 1200 E. California Blvd, Pasadena, CA 91125, USA