1. Cosmic Dawn Center (DAWN), Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark; DTU-Space, Technical University of Denmark, Elektrovej 327, DK-2800 Kgs. Lyngby, Denmark
2. Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark
3. Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK
4. Observatoire de Paris, LERMA, College de France, DNRS, PSL, Sorbonne Univ. UPMC, F-75014 Paris, France
5. Centro de Astrobiología (CAB, CSIC-INTA), ESAC Campus, E-28692 Villanueva de la Cañada, Madrid, Spain
6. CEA Saclay, Laboratoire AIM-CNRS-Université Paris Diderot, Irfu/SAp, Orme des Merisiers, F-91191 Gif-sur Yvette, France
7. National Astronomical Observatories of China, Chinese Academy of Sciences, 100012 Beijing, PR China
8. Instituto de Radioastronomía Milimétrica, Av. Divina Pastora 7, Núcleo Central, E-18012 Granada, Spain