1. Oxford Astrophysics, Denys Wilkinson Building, University of Oxford, Keble Rd, Oxford OX1 3RH, UK
2. Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
3. Faculty of Physics, Ludwig-Maximilians-Universität, Scheinerstr 1, D-81679 Munich, Germany
4. South African Radio Astronomy Observatory, 2 Fir Street, Observatory, Cape Town 7925, South Africa
5. The Inter-University Institute for Data Intensive Astronomy (IDIA), and University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
6. Department of Physics and Astronomy, University of the Western Cape, Robert Sobukwe Road, Bellville 7535, South Africa
7. Department of Physics & Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA
8. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
9. Inter-University Institute for Data Intensive Astronomy, Bellville 7535, South Africa
10. ASTRON, the Netherlands Institute for Radio Astronomy, Oude Hoogeveesedijk 4, NL-7991 PD Dwingeloo, the Netherlands
11. Kapteyn Astronomical Institute, PO Box 800, NL-9700 AV Groningen, the Netherlands
12. INAF-IRA, Via P. Gobetti 101, I-40129 Bologna, Italy
13. Department of Physics and Astronomy, Universitá degli Studi di Padova, Vicolo dell’Osservatorio 3, I-35122 Padova, Italy
14. INAF - Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova, Italy
15. Department of Physics and Electronics, Rhodes University, PO Box 94, Makhanda 6140, South Africa
16. School of Science, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
17. CSIRO Astronomy and Space Science, PO Box 1130, Bentley, WA 6102, Australia
18. National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM 87801, USA