Affiliation: | Department of Physics, University of Queensland, Brisbane, Qld 4072, Australia;Astronomy Unit, School of Mathematical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS;Astrophysics Group, H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL;Department of Physics, University of California, One Shields Avenue, Davis, CA 95616-8677, USA |