1. Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK
2. Instituto de Astrofìsica de Canarias, E-38205 La Laguna, Tenerife, Spain
3. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
4. Department of Physics, University of Warwick, Coventry CV4 7AL, UK
5. European Southern Observatory, Karl-Schwarzschild Str. 2, D-85748 Garching bei München, Germany
6. National Astronomical Research Institute of Thailand, 191 Siriphanich Building, Huay Kaew Road, Chiang Mai 50200, Thailand
7. Square Kilometre Array Organization, Jodrell Bank Observatory, Macclesfield SK11 9DL, UK
8. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK
9. Dark Cosmology Centre, Niels Bohr Institutet, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark
10. Instituto Nazionale di Astrofisica (INAF) Osservatorio Astronomico di Cagliari, Via della Scienza 5, I-09047 Selargius (CA), Italy