1. Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
2. Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany.
3. Department of Physics and Astronomy, Uppsala University, P. O. Box 516, S-75120 Uppsala, Sweden.
4. Charles University, Faculty of Mathematics and Physics, DCMP, Ke Karlovu 5, CZ-12116 Prague 2, Czech Republic.
5. IT4Innovations-Czech National Supercomputing Centre, VSB–Technical University Ostrava, 17. listopadu 2172/15, CZ-708 00 Ostrava, Czech Republic.