1. South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa
2. Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
3. LESIA, 5 place Jules Janssen, Observatoire de Paris, CNRS, PSL, Meudon 92195, France
4. International Centre for Radio Astronomy Research - Curtin University, GPO Box U1987, Perth, WA 6845, Australia
5. School of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, UK
6. Department of Physics, Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
7. Department of Physics and Astronomy, Jodrell Bank Centre for Astrophysics, The University of Manchester, Manchester M13 9PL, UK
8. Department of Astronomy, Inter-University Institute for Data Intensive Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
9. South African Radio Astronomy Observatory, 2 Fir Street, Black River Park, Observatory, Cape Town 7925, South Africa
10. Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010, NL-6500 GL Nijmegen, the Netherlands
11. Department of Physics and Electronics, Rhodes University, PO Box 94, Makhanda 6140, South Africa
12. Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
13. Department of Physics, The George Washington University, 725 21st Street NW, Washington, DC 20052, USA
14. Astronomy, Physics and Statistics Institute of Sciences (APSIS), 725 21st Street NW, Washington, DC 20052, USA
15. Office of Astronomy for Development, IAU, Cape Town 7935, South Africa
16. Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK
17. National Radio Astronomy Observatory, Socorro, NM 87801, USA
18. Caltech, 1200 E. California Blvd. MC 249-17, Pasadena, CA 91125, USA
19. Anton Pannekoek Institute, University of Amsterdam, Postbus 94249, NL-1090 GE Amsterdam, the Netherlands
20. Netherlands Institute for Radio Astronomy (ASTRON), Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, the Netherlands