Affiliation: | Harvard–Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA;Mullard Space Science Laboratory (UCL), Holmbury St Mary, Dorking, Surrey RH5 6NT;INAF, Osservatorio di Arcetri, Lgo Fermi 5, 50125 Firenze, Italy;Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH;INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Palermo, Italy |