1. Centre for Astrophysics and Supercomputing, Swinburne University, Hawthorn Victoria 3122, Australia
2. Astrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, Liverpool L3 5RF, UK
3. Department of Physics, University of Surrey, Guildford GU2 7XH, UK
4. Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Monchhofstraße 12-14, 69120 Heidelberg, Germany
5. Department of Astrophysics/IMAPP, Radboud University, PO Box 9010, 6500 GL Nijmegen, The Netherlands
6. Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
7. Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, PO Box 43, 22100 Lund, Sweden
8. School of Physics, The University of Melbourne, Victoria 3010, Australia
9. Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK
10. Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA