1. ESO, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
2. Department of Physics and Astronomy, University of Hawaii, 2505 Correa Road, Honolulu, HI 96822, USA
3. Institute for Astronomy, 2680 Woodlawn Drive, University of Hawaii, Honolulu, HI 96822, USA
4. Institut de Ciències del Cosmos, Universitat de Barcelona (UB-IEEC), E-08028 Barcelona, Spain
5. Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain
6. Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
7. Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA
8. SRON Netherlands Institute for Space Research, Landleven 12, NL-9747 AD, Groningen, The Netherlands
9. Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 AV, Groningen, The Netherlands