1. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia
2. ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Canberra, ACT 2611, Australia
3. International Centre for Radio Astronomy Research, University of Western Australia, 7 Fairway, Crawley, WA 6009, Australia
4. Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE, UK
5. Centre for Extragalactic Astronomy, Durham University, South Road, Durham DH1 3LE, UK
6. Centre for Advanced Instrumentation, Department of Physics, Durham University, South Road, Durham DH1 3LE, UK