1. Department of Physics and Electronics, Rhodes University, PO Box 94, Makhanda, 6140, South Africa
2. Australia Telescope National Facility, CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia
3. Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
4. South African Radio Astronomy Observatory, Black River Park, 2 Fir Street, Observatory, Cape Town, 7925, South Africa
5. Instituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía, E-18008 Granada, Spain
6. Steward Observatory, University of Arizona, 933 North Cherry Avenue, Rm. N204, Tucson, AZ 85721-0065, USA
7. Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
8. Département de physique, Université de Montréal, C.P. 6128, Succ. centre-ville, Montréal, Québec, H3C 3J7, Canada
9. Observatoire d’Astrophysique de l’Université de Ouagadougou, BP 7021, Ouagadougou 03, Burkina Faso
10. Netherlands Institute for Radio Astronomy (ASTRON), Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, the Netherlands
11. Kapteyn Astronomical Institute, University of Groningen, Postbus 800, NL-9700 AV Groningen, the Netherlands
12. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
13. Department of Physics and Astronomy, University of the Western Cape, Robert Sobkwe Road, Bellville 7535, South Africa
14. Department of Physics, University of Pretoria, Hatfield, Pretoria 0028, South Africa
15. INAF – Osservatorio Astronomico di Cagliari, Via della Scienza 5, I-09047 Selargius (CA), Italy
16. Faculty of Physics and Astronomy, Astronomical Institute, Ruhr University Bochum, D-44780 Bochum, Germany
17. School of Physics, University of the Witwatersrand, 1 Jan Smuts Avenue, Braamfontein, Johannesburg 2000, South Africa