1. Institute of Physics, Ernst-Moritz-Arndt University of Greifswald, 17489 Greifswald, Germany
2. Neumann Space Pty Ltd., 41 Wood Avenue, Brompton 5007, South Australia, Australia
3. Department of Applied Mathematics, Physics and Humanities, Nuremberger Institute of Technology, 90489 Nuremberg, Germany
4. Institute of Computer Science, University of Rostock, 18059 Rostock, Germany