1. Department of Physics NanoSystems Initiative Munich and Center for Nanoscience Ludwig-Maximilians-Universität München Amalienstrasse 54 80799 Munich Germany
2. Tescan Brno s.r.o. Libušina třída 1 62300 Brno Czech Republic
3. Department of Geological Sciences Faculty of Science Masaryk University Kotlářská 2 61137 Brno Czech Republic
4. Institute of Biophysics Academy of Sciences of the Czech Republic Královopolská 135 61265 Brno Czech Republic