1. Universitat Heidelberg, Zentrum fur Astronomie, Institut fur Theoretische Astrophysik , Albert-Ueberle-Str. 2, D-69120 Heidelberg, Germany
2. Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester , Oxford Road, Manchester M13 9PL, UK
3. Universität Heidelberg, Interdisziplinäres Zentrum für Wissenschaftliches Rechnen , Im Neuenheimer Feld 205, D-69120 Heidelberg, Germany
4. Department of Astrophysics, American Museum of Natural History , 79th St. at Central Park West, New York, NY 10024, USA
5. Institute of Physics, Laboratory for galaxy evolution and spectral modelling, EPFL , Observatoire de Sauverny, Chemin Pegais 51, 1290 Versoix, Switzerland
6. Max-Planck-Institut für Astrophysik , Karl-Schwarzschild-Str. 1, D-85741 Garching, Germany
7. Istituto di Astrofisica e Planetologia Spaziali (IAPS). INAF. Via Fosso del Cavaliere 100 , I-00133 Roma, Italy