1. University of New South Wales Sydney, Sydney, NSW 2052, Australia.
2. College of Science and Engineering, University of Leicester, University Road, Leicester LE17RH, UK.
3. DAMTP, Centre for Mathematical Sciences, University of Cambridge, Cambridge CB3 0WA, UK.
4. Department of Physics and Astronomy, University College London, London WC1E 6BT, UK.
5. Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK.
6. Institute of Physics, University of Szczecin, Wielkopolska 15, 70-451 Szczecin, Poland.
7. Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
8. Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal.
9. Instituto de Astrofísica e Ciências do Espaço, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal.
10. Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4150-007 Porto, Portugal.
11. Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, D-21029 Hamburg, Germany.
12. Maritime University, Wały Chrobrego 1-2, 70-500 Szczecin, Poland.
13. European Southern Observatory, 85748 Garching bei München, Germany.
14. Ludwig-Maximilians-Universität, 80799 Munich, Germany.
15. National Institute for Astrophysics, Astronomical Observatory of Trieste, Via G.B. Tiepolo 11, I34134, Italy.