| Affiliation: | Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia;Australia Telescope National Facility, PO Box 76, Epping, NSW 1710, Australia;Physics Department, University of Durham, South Road, Durham DH1 3LE;Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1lD;Department of Physics, Oxford University, Keble Road, Oxford OX1 3RH;Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey RH5 6NT;Department of Physics, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USA;Centro de Astrofísica da Universidade do Porto, R. das Estrelas s/n, 4150-762 Porto, Portugal |
