| Institution: | Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA; Osservatorio Astronomico di Bologna, via Zamboni 33, I-40126 Bologna, Italy; Leiden Observatory, PO Box 9513, 2300 RA Leiden, the Netherlands; Astrophysics Group, Imperial College, Blackett Laboratory, Prince Consort Road, London SW7 2BZ; Service d'Astrophysique, Saclay, F-91191 Gif-sur-Yvette, France; SISSA, Via Beirut 2--4, Trieste, Italy; Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy; Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, D-8046 Garching bei Munchen, Germany; Institute for Astronomy, University of Edinburgh Blackford Hill, Edinburgh EH9 3HJ; Max-Plank-Institut für Astronomie, Körnigstuhl 17, D-69117 Heidelberg, Germany; Institut d'Astrophysique Spatiale, Bat. 121, UniversitéParis XI, F-91405 Orsay, France; Institut d'Astrophysique de Paris, CNRS, 98 bis Bd. Arago, F-75014 Paris, France |
