1. Division of Biology and Chemistry, Paul Scherrer Institut, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
2. Swiss Nanoscience Institute, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
3. Photon Science Division, Paul Scherrer Institut, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
4. Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forchungszentrum Jülich, Wilhelm-Johnen-Strasse, 52425 Jülich, Germany
5. RWTH Aachen University, Ahornstraße 55, 52074 Aachen, Germany
6. Biozentrum, University of Basel, Klingelbergstrasse 70, 4056 Basel, Switzerland