1. European Southern Observatory, Karl Schwarzschild Straße 2, D-85748 Garching, Germany
2. Department of Physics, University of Warwick, Coventry CV4 7AL, UK
3. Sixfold GmbH, Magirus-Deutz-Straße 16, D-89077 Ulm, Germany
4. GEPI (Galaxies-Etoiles-Physique-Instrumentation), Observatoire de Paris, 5 Place Jules Janssen, F-92195 Meudon Cedex, France
5. Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
6. Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstraße 12–14, D-69120 Heidelberg, Germany