1. JBCA, Dept. of Physics & Astronomy, University of Manchester, Manchester M13 9PL, UK
2. School of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
3. SUPA, Institute for Astronomy, Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, UK
4. Hamburger Sternwarte, University of Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
5. INAF — Istituto di Radioastronomia, via P. Gobetti 101, 40129 Bologna, Italy
6. ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA, Dwingeloo, the Netherlands
7. Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire, Hertfordshire AL10 9AB, UK
8. CSIRO Astronomy and Space Science, PO Box 1130, Bentley, WA 6102, Australia
9. School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK
10. Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30–244 Krakow, Poland
11. Kapteyn Astronomical Institute, University of Groningen, P.O. Box 800, 9700 AV Groningen, the Netherlands
12. Dipartimento di Fisica e Astronomia, Università degli Studi di Bologna, via P. Gobetti 93/2, 40129 Bologna, Italy
13. Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands
14. Anton Pannekoek Institute for Astronomy, University of Amsterdam, Postbus 94249, 1090 GE Amsterdam, the Netherlands
15. GEPI, Observatoire de Paris, CNRS, Universite Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France
16. Dept. of Physics & Electronics, Rhodes University, PO Box 94, Grahamstown, 6140, South Africa
17. Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada