1. Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, UK
2. Dr. Karl Remeis-Observatory & ECAP, Friedrich-Alexander University Erlangen-Nürnberg , Sternwartstr. 7, D-96049 Bamberg, Germany
3. Institut für Physik und Astronomie, Universität Potsdam , Haus 28, Karl-Liebknecht-Str. 24/25, D-14476 Potsdam-Golm, Germany
4. Texas Tech University, Department of Physics & Astronomy , Box 41051, Lubbock, TX 79409, USA
5. Astronomical Institute of the Czech Academy of Sciences , CZ-25165, Ondřejov, Czech Republic
6. Astroserver.org , Fő tér 1, 8533 Malomsok, Hungary
7. Centre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, DH1 3LE Durham, UK