1. School of Physical and Chemical Sciences, University of Canterbury, Science Road, Christchurch 8140, New Zealand
2. Department of Astronomy, University of California Berkeley, Berkeley, CA 94720, USA
3. Physics Department, Texas Tech University, PO Box 41051, Lubbock, TX 79409, USA
4. Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, AL10 9AB, UK
5. UK Astronomy Technology Centre, Royal Observatory Edinburgh, Edinburgh EH9 3HJ, UK
6. National Radio Astronomy Observatory, Socorro, NM 87801, USA
7. Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Moenchhofstrasse 12-14, 69120 Heidelberg, Germany
8. European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany
9. INAF/Osservatorio Astrofisico of Arcetri, Largo E. Fermi, 5, I-50125 Firenze, Italy