1. Mullard Space Science Laboratory (MSSL), University College London, Surrey RH5 6NT, UK
2. Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, UK
3. Center for Computational Astrophysics, 160 5th Avenue, New York, NY 10010, USA
4. Department of Physics and Astronomy, University College London, London WC1E 6BT, UK
5. The Oskar Klein Centre for Cosmoparticle Physics, Stockholm University, Stockholm, Sweden
6. Institute of Sensors, Signals, and Systems, Heriot-Watt University, Edinburgh EH14 4AS, UK
7. Centre for Cosmology, Particle Physics and Phenomenology, Université Catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
8. Institut d’Astrophysique de Paris, Paris F-75014, France