1. Department of Physics, Technische Universität Dortmund, 44227 Dortmund, Germany
2. Institute for Theoretical Physics, Georg-August University Göttingen, 37077 Göttingen, Germany
3. Molecular Microbiology and Structural Biochemistry (MMSB, UMR 5086), CNRS and University of Lyon, 69367 Lyon, France
4. Leiden Institute of Chemistry, Leiden University, 2333 CC Leiden, The Netherlands