1. Astronomical Institute Anton Pannekoek, Amsterdam University, Science Park 904, 1098 XH, Amsterdam, Netherlands.
2. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA.
3. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA.
4. Astronomical Institute, Utrecht University, Princetonplein 5, 3584 CC, Utrecht, Netherlands.
5. Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany.
6. UK Astronomy Technology Centre, Royal Observatory Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK.
7. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK.
8. Fonds de la Recherche Scientifique—FNRS, Institut d’Astrophysique, Liège University, Allée du 6 Août 17, B-4000 Liège, Belgium.
9. Université Joseph Fourier–Grenoble 1/CNRS–Institut National des Sciences de l’Univers, Institut de Planétologie et d’Astrophysique de Grenoble UMR 5274, Grenoble, France.