1. Centre for Astrophysics and Cosmology, Science Institute, University of Iceland, Dunhagi 5, 107 Reykjavík, Iceland
2. Cosmic Dawn Center (DAWN), Niels Bohr Institute, University of Copenhagen, Jagtvej 128, DK-2200 Copenhagen N, Denmark
3. Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
4. Institut d’Astrophysique de Paris, CNRS-SU, UMR 7095, 98bis bd Arago, F-75014 Paris, France
5. Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, UK
6. European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago, Chile
7. European Southern Observatory, Karl-Schwarzschildstrasse 2, D-85748 Garching bei München, Germany
8. Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía, s/n, E-18008 Granada, Spain