Affiliation: | 1. School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK;2. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, VIC 3122, Australia;3. Kapteyn Astronomical Institute, University of Groningen, Postbus 800, NL-9700 AV Groningen, The Netherlands;4. Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK |