1. Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, UK
2. International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia
3. Australian Research Council Centre of Excellence for All-Sky Astrophysics (CAASTRO), NSW 2006, Australia
4. SKA SA, 3rd Floor, The Park, Park Road, Pinelands, 7405, South Africa
5. Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown 6140, South Africa
6. Cambridge Consultants Ltd, Cambridge, CB4 0DW, UK
7. Kapteyn Astronomical Institute, University of Groningen, PO Box 800, NL-9700AV, Groningen, the Netherlands
8. ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, NL-7990 AA Dwingeloo, the Netherlands