1. Max Planck Institute of Colloids and Interfaces, 14467, Potsdam, Germany
2. Institute of Biological Information Processing: Structural Biochemistry (IBI-7), Forschungszentrum Jülich, 52428 Jülich, Germany
3. Institute for Condensed Matter Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany