1. CSIRO Astronomy & Space Science, PO Box 76, Epping, NSW 1710, Australia
2. Department of Astronomy, Haverford College, Haverford, PA 19041, USA
3. National Research Council Canada, Herzberg Program in Astronomy and Astrophysics, Dominion Radio Astrophysical Observatory, PO Box 248, Penticton, British Columbia V2A 6J9, Canada
4. Physics and Astronomy Department, Okanagan College, 1000 KLO Road, Kelowna, British Columbia V1Y 4X8, Canada
5. Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia
6. Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, Ontario M5S 3H4, Canada
7. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121, Bonn, Germany
8. Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia
9. Skaha Remote Sensing, 3165 Juniper Drive, Naramata, BC V0H 1N0, Canada
10. University of Tasmania, School of Mathematics and Physics, Hobart, TAS 7001, Australia
11. Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, NL-6500 GL, Nijmegen, the Netherlands
12. Jodrell Bank Centre for Astrophysics, Alan Turing Building, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK