1. European Southern Observatory , D-85748 Garching, Germany
2. Instituto de Astrofísica de Canarias , E-38200 La Laguna, Tenerife, Spain
3. Departamento de Astrofísica, Universidad de La Laguna , E-38206 La Laguna, Tenerife, Spain
4. Nordic Optical Telescope , Rambla José Ana Fernández Pérez 7, E-38711 Breña Baja, Spain
5. Institut für Physik, Karl-Franzens Universität Graz, Universitätsplatz 5/II , NAWI Graz, A-8010 Graz, Austria
6. Anton Pannekoek Institute for Astronomy, University of Amsterdam , 1090 GE Amsterdam , the Netherlands
7. Institute of Astronomy , KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
8. Department of Theoretical Physics and Astrophysics, Masaryk Univesity , Kotlářská 2, CZ-60200 Brno, Czech Republic
9. Astronomical Institute of the Czech Academy of Sciences , Fričova 298, CZ-25165 Ondřejov, Czech Republic
10. Institute for Astronomy, University of Edinburgh , Royal Observatory, Edinburgh EH9 3HJ, UK
11. DAWN, Niels Bohr Institute, University of Copenhagen , Jagtvej 128, DK-2200 Copenhagen N, Denmark
12. Nicolaus Copernicus Astronomical Center , Bartycka 18, PL-00-716 Warsaw, Poland
13. Thueringer Landessternwarte Tautenburg , Sternwarte 5, D-07778 Tautenburg, Germany