1. Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
2. Department of Physics and Astronomy, University of Utah, 115 South 1400 East, Salt Lake City, Utah 84112, USA
3. Sub-Department of Astrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
4. Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia
5. Australian Gemini Office, Australian Astronomical Observatory, PO Box 915, Sydney, NSW 1670, Australia
6. Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482, Potsdam, Germany
7. European Space Agency, c/o STScI, 3700 San Martin Drive, Baltimore, MD 21218, USA