1. School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, Scotland, UK
2. Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2a, FI-00014 Helsinki, Finland
3. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
4. Cosmic Dawn Center (DAWN)
5. Niels Bohr Institute, University of Copenhagen, Lyngbyvej 2, DK-2100 Copenhagen Ø, Denmark