1. Department of Physics and Astronomy, University of British Columbia, 6225 Agricultural Road, Vancouver V6T 1Z1, Canada
2. Department of Physics and Atmospheric Science, Dalhousie University, 6310 Coburg Road, Halifax B3H 4R2, Canada
3. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
4. Centre for Extragalactic Astronomy, Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
5. Herzberg Astronomy and Astrophysics, National Research Council Canada, 5071 West Saanich Road, Victoria V9E 2E7, Canada
6. Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
7. H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK
8. European Southern Observatory, Karl-Schwarzschild-Straße 2, Garching D-85748, Germany
9. Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK
10. Department of Physics MC 0435, Virginia Polytechnic Institute and State University, 850 West Campus Drive, Blacksburg, VA 24061, USA
11. Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire, Roehyde Way, Hatfield AL10 9AB, UK
12. Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton L8S 4M1, Canada
13. Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, ul. Słoneczna 36, PL-60-286 Poznań, Poland
14. Academia Sinica Institute of Astronomy and Astrophysics, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
15. Leiden Observatory, Leiden University, PO box 9513, Leiden, NL-2300 RA, the Netherlands