1. Institute for Multiscale Simulation, Friedrich-Alexander-Universität, Nägelsbachstrasse 49b, 91052 Erlangen, Germany
2. Fraunhofer Institute for Integrated Circuits, Flugplatzstrasse 75, 90768 Fürth, Germany
3. Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany