1. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.
2. Commonwealth Science and Industrial Research Organisation (CSIRO) Astronomy and Space Science, Australia Telescope National Facility, Post Office Box 76, Epping, NSW 1710, Australia.
3. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Mail H30, Post Office Box 218, Hawthorn, VIC 3122, Australia.
4. Australian Research Council Centre of Excellence for All-Sky Astrophysics (CAASTRO), Mail H30, Post Office Box 218, Hawthorn, VIC 3122, Australia.
5. West Virginia University Center for Astrophysics, West Virginia University, Morgantown, WV 26506, USA.
6. International Centre for Radio Astronomy Research, Department of Imaging and Applied Physics, Faculty of Science and Engineering, Curtin University, Post Office Box U1987, Perth, WA 6845, Australia.
7. Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Cagliari, Loc. Poggio dei Pini, Strada 54, 09012 Capoterra (CA), Italy.
8. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91104, USA.
9. Max-Planck-Institut für Radio Astronomie, Auf dem Hugel 69, 53121 Bonn, Germany.
10. Dipartimento di Fisica, Universita di Cagliari, Cittadella Universitaria 09042, Monserrato (CA), Italy.