1. Centre for Astrophysics and Supercomputing and ARC Centre for All-Sky Astrophysics (CAASTRO), Swinburne University of Technology, Post Office Box 218 Hawthorn, VIC 3122, Australia.
2. Department of Astronomy, University of California, Berkeley, CA 94720, USA.
3. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK.
4. Caltech Optical Observatories, California Institute of Technology, MS 249-17, Pasadena, CA 91125, USA.
5. Istituto Nazionale di Astrofisica–Osservatorio Astronomico di Cagliari, Poggio dei Pini, 09012 Capoterra, Italy.
6. Australia Telescope National Facility, Commonwealth Scientific and Industrial Research Organisation (CSIRO) Astronomy and Space Science, Post Office Box 76, Epping NSW 1710, Australia.
7. Dipartimento di Fisica, Università degli Studi di Cagliari, Cittadella Universitaria, 09042 Monserrato (CA), Italy.
8. Max-Planck Institut für Radioastronomie, Auf dem Huegel 69, 53121 Bonn, Germany.