1. Departments of Biomaterials and Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany
2. Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg, Germany
3. Synchrotron SOLEIL, 91192 Gif-sur-Yvette Cedex, France