1. Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029, Blindern, 0315 Oslo, Norway
2. Department of Biology, Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo, P.O. Box 1066, Blindern, 0316 Oslo, Norway
3. Department of Physics, The Norwegian University of Science and Technology, 7491 Trondheim, Norway
4. Centre for Advanced Study (CAS), Drammensveien 78, 0271 Oslo, Norway