1. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL
2. Department of Physics, West Virginia University, Morgantown, WV 26506, USA
3. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218 Hawthorn, VIC 3122, Australia
4. The ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO)
5. INAF—Osservatorio Astronomico di Cagliari, Poggio dei Pini, 09012 Caopterra, Italy
6. NASA Jet Propulsion Laboratory, M/S 138-307, Pasadena, CA 91106, USA
7. MPI fuer Radioastronomie, Auf dem Huegel 69, 53121 Bonn, Germany
8. Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia
9. Dipartimento di Fisica, Università degli Studi di Cagliari, Cittadella Universitaria, 09042 Monserrato (CA), Italy