[1] ESA, European Space Astronomy Centre (ESAC), Apartado 78, 28691 Villanueva de la Cañada (Madrid), Spain
[2] Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, United Kingdom
[3] NASA, Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, United States
[4] University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, United States
[5] ISDC Data Centre for Astrophysics, Chemin d'Écogia 16, 1290 Versoix, Switzerland
[6] Observatoire Astronimique, L'Université de Genève, Chemin des Maillettes 51, 1290 Sauverny, Switzerland
[7] Astroph. Research Institute, Liverpool John Moores Univ., Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD 7, United Kingdom
[8] IEEC-CSIC, Campus UAB, Facultat Ciències, C5-par. 2on, 08193 Bellaterra, Spain
[9] CRESST, X-ray Astrophysics Laboratory, NASA/GSFC, Greenbelt, MD 20771, United States
[10] INAF, Osservatorio Astronomico di Padova, vicolo Osservatorio 5, 35122 Padova, Italy
[11] Department of Astronomy, University of Wisconsin, 475 N. Charter Str., Madison WI 53706, United States
[12] Grup d'Astronomia i Astrofísica, Dept. Física i Enginyeria Nuclear, Univ. Politècnica de Catalunya, 08036 Barcelona, Spain
[13] School of Earth and Space Exploration, Arizona State University, PO Box 871404, AZ 85287-1404, United States