1. Research School of Astronomy and Astrophysics, Australian National University , Canberra, ACT 2611 , Australia
2. ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Stromlo, ACT 2611 , Australia
3. Harvard-Smithsonian Center for Astrophysics , 60 Garden Street, Cambridge, MA 02138 , USA
4. Leiden Observatory, Leiden University , PO Box 9513, NL-2300 RA Leiden , the Netherlands
5. International Centre for Radio Astronomy Research, The University of Western Australia , 35 Stirling Highway, Crawley, WA 6009 , Australia
6. School of Physics, University of New South Wales , Sydney, NSW 2052 , Australia
7. University of Western Cape , Bellville, Cape Town 7535 , South Africa
8. INFN – Sezione di Trieste , via Valerio 2, I-34127 Trieste , Italy
9. Cosmic Dawn Center (DAWN), University of Copenhagen , DK-1172 Copenhagen , Denmark
10. Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney , Sydney, NSW 2006 , Australia
11. Fakultät für Physik, Ludwig-Maximilians-Universität München, Universitäts-Sternwarte , Scheinerstraße 1, D-81679 München , Germany
12. International Centre for Radio Astronomy Research (ICRAR), Curtin University , Bentley, WA 6102 , Australia
13. Department of Astrophysics, University of Vienna , Türkenschanzstraße 17, A-1180 Vienna , Austria
14. Institute for Theory and Computation, Harvard-Smithsonian Center for Astrophysics , Cambridge, MA 02138 , USA