1. Institute of Cosmology and Gravitation, University of Portsmouth , Burnaby Road, Portsmouth PO1 3FX , UK
2. Centre for Astrophysics Research, School of Physics, Engineering & Computer Science, University of Hertfordshire , Hatfield AL10 9AB , UK
3. Astronomy Centre, University of Sussex , Falmer, Brighton BN1 9QH , UK
4. Cosmic Dawn Center (DAWN) , Rådmandsgade 62, 2200 København N , Denmark
5. DTU-Space, Technical University of Denmark , Elektrovej 327, DK-2800 Kgs. Lyngby , Denmark
6. Department of Physics, University of Helsinki , Gustaf Hällströmin katu 2, FI-00014 Helsinki , Finland
7. Jodrell Bank Centre for Astrophysics, University of Manchester , Oxford Road, Manchester, M13 9PY , UK
8. INAF Osservatorio Astronomico di Roma , Via Frascati 33, Monte Porzio Catone, I-00078 Rome , Italy