[1] Vrije Universiteit Brussel, 2 Pleinlaan, Brussels, Belgium
[2] ESO - European Southern Observatory, Casilla 91001, Santiago, Chile
[3] Department of Astronomy, University of Trieste, via Tiepolo 11, Trieste, Italy
[4] INAF - Osservatorio Astrofisico di Arcetri, L.go E. Fermi 5, Firenze, Italy
[5] Kavli Institute for Theoretical Physics, UC Santa Barbara, CA 93106, United States
[6] Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD, United States
[7] Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, United States
[8] Department of Physics and Astronomy, SUNY, Stony Brook, NY 11794-3800, United States
[9] Aerospace Corporation, PO Box 92957, Los Angeles, CA 90009-2957, United States
[10] University of California San Diego, 9500 Gilman Dr., San Diego, CA, United States
[11] NASA Langley Research Center, 100 NASA Road, Hampton, VA, United States
[12] Isaac Newton Institute, Casilla 8-9, Correo 9, Santiago, Chile
[13] Department of Astronomy and Astrophysics, Penn State University, 525 Davey Lab., University Park, PA, United States