1. PMMH (UMR 7636 CNRS - ESPCI - UPMC Paris 6 - UPD Paris 7), 10 rue Vauquelin, 75005 Paris, France
2. Fachbereich Physik, Philipps-Universität Marburg, 35032 Marburg, Germany
3. Max Planck Institute for Dynamics and Self-Organization, Am Fassberg 17, 37077 Göttingen, Germany
4. Emergent Complexity in Physical Systems Laboratory (ECPS), Ecole Polytechnique Fédérale de Lausanne, Switzerland
5. Department of Mathematics and Statistics, University of New Hampshire, Durham, New Hampshire 03824, USA