1. Instituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía, E-18008 Granada, Spain
2. Department of Physics and Electronics, Rhodes University, PO Box 94, Makhanda 6140, South Africa
3. South African Radio Astronomy Observatory, 2 Fir Street, Black River Park, Observatory, Cape Town 7925, South Africa
4. Australia Telescope National Facility, CSIRO Astronomy and Space Science, PO Box 76, NSW 1710, Epping, Australia
5. Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
6. Max-Planck-Institut für Radioastronomie, Radioobservatorium Effelsberg, Max-Planck-Straße 28, D-53902 Bad Münstereifel, Germany
7. Ruhr University Bochum, Faculty of Physics and Astronomy, Astronomical Institute, D-44780 Bochum, Germany
8. Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, NL-7990 AA Dwingeloo, the Netherlands
9. Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
10. Kapteyn Astronomical Institute, University of Groningen, Postbus 800, NL-9700 AV Groningen, the Netherlands
11. INAF - Osservatorio Astronomico di Cagliari, Via della Scienza 5, I-09047 Selargius (CA), Italy
12. Département de physique, Université de Montréal, Complexe des sciences MIL, 1375 Avenue Thérèse-Lavoie-Roux Montréal, Qc, H2V 0B3, Canada
13. Laboratoire de Physique et de Chimie de l’Environnement, Observatoire d’Astrophysique de l’Université Ouaga I Pr Joseph Ki-Zerbo (ODAUO), BP 7021, Ouaga 03, Burkina Faso
14. Department of Physics, University of Pretoria, Hatfield, Pretoria 0028, South Africa
15. The Inter-University Institute for Data Intensive Astronomy (IDIA), Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
16. University of the Witswatersrand, 1 Jan Smuts Avenue, Braamfontein 2000, Johannesburg, South Africa