Institution: | * Max-Planck Institut für Extraterrestrische Physik, D-8046 Garching, Germany ** SRON-Leiden, P.O.B. 9504, 2300 RA, Leiden, The Netherlands *** ISEOS, University of New Hampshire, Durham, NH 03824, USA † Astrophysics Division, ESA/ESTEC, 2200 AG, Noordwijk, The Netherlands |