1. Expertisecentrum voor Digitale Media, UHasselt – tUL, Wetenschapspark 2, B-3590 Diepenbeek, Belgium
2. School of Physics and Astronomy, University of Minnesota, 116 Church Street, Minneapolis, MN 55455, USA
3. Astron. Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr 12–14, D-69120 Heidelberg, Germany
4. Department of Physics & Astronomy, Ghent University, Krijgslaan 281, S9, B-9000 Ghent, Belgium