1. Astrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, Liverpool L3 5RF, UK
2. Institut de Física d’Altes Energies, The Barcelona Institute of Science and Technology, E-08193 Bellaterra (Barcelona), Spain
3. National Centre for Nuclear Research, ul. Hoza 69, PL-00-681 Warsaw, Poland
4. Department of Astronomy, Indiana University, Bloomington, IN 47405, USA
5. Astronomical Observatory of the Jagiellonian University, ul. Orla 171, PL-30-244 Kraków, Poland
6. Aix Marseille Univ. CNRS, CNES, F-13388 LAM Marseille, France
7. Department of Applied Mathematics, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, UK
8. Institute of Physics, Jan Kochanowski University, ul. Swietokrzyska 15, PL-25-406 Kielce, Poland
9. Department of Astronomy & Physics and the Institute for Computational Astrophysics, Saint Mary’s University, 923 Robie Street, Halifax, NS B3H 3C 3, Canada
10. INAF - OAS Bologna, Via P. Gobetti 93, I-40129 Bologna, Italy
11. Lichtenbergstraße 8, D-85748 Garching, Germany