1. Max Planck Institute for Astronomy; Königstuhl 17; D-69117; Heidelberg; Germany
2. Space Telescope Science Institute and European Space Agency; 3700 San Martin Drive; Baltimore; MD; 21218; USA
3. Department of Astronomy; University of Wisconsin-Madison; 5534 Sterling, 475 North Charter Street; Madison; WI; 53706; USA
4. Excellence Cluster Universe; Boltzmann-Strasse 2; 85748; Garching bei München; Germany
5. ESO; Karl-Schwarzschild-Strasse 2; 85748; Garching bei München; Germany
6. Department of Astronomy & Astrophysics; The Pennsylvania State University; University Park; PA; 16802; USA
7. Department of Astronomy; Stockholm University; Oscar Klein Center, AlbaNova; Stockholm; SE-106 91; Sweden
8. Department of Astrophysics/IMAPP; Radboud University Nijmegen; PO Box 9010; 6500; GL Nijmegen; the Netherlands
9. Département de Physique; de Génie Physique et d'Optique, and Centre de Recherche en Astrophysique du Québec (CRAQ); Université Laval; Québec; QC; G1V 0A6; Canada
10. Department of Astronomy; University of Washington; Box 351580; Seattle; WA; 98195; USA