[1] X-ray Astronomy Group, Department of Physics and Astronomy, Leicester University, Leicester LE1 7RH, United Kingdom
[2] Instituto de Física de Cantabria (CSIC-UC), 39005 Santander, Spain
[3] INAF, Osservatorio Astronomico di Brera, via Brera 28, 20121 Milan, Italy
[4] Istituto Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
[5] Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, United Kingdom
[6] European Southern Observatory, Casilla 19001, Santiago 19, Chile
[7] Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 144482 Potsdam, Germany
[8] XMM SOC, ESAC, Apartado 78, 28691 Villanueva de la Caada, Madrid, Spain
[9] Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, Garching 85748, Germany