1. Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
2. Argelander-Institut für Astronomie, Auf dem Hügel 71, D-53121 Bonn, Germany
3. Centre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia
4. Leiden Observatory, Leiden University, Niels Bohrweg 2, NL-2333 CA Leiden, the Netherlands
5. Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
6. Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA
7. Center for Cosmology and AstroParticle Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210, USA
8. Kapteyn Astronomical Institute, University of Groningen, NL-9700AD Groningen, the Netherlands
9. Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
10. Australian Astronomical Observatory, PO Box 915, North Ryde, NSW 1670, Australia
11. INAF – Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I-80131 Napoli, Italy
12. School of Mathematics and Physics, University of Queensland, Brisbane, QLD 4072, Australia
13. Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia