1. Electron Microscopy Group of Materials Science, Ulm University, Albert-Einstein-Allee 11, Ulm 89081, Germany
2. Institute of Ion Beam Physics and Materials Research, Helmholtz-Centre Dresden-Rossendorf, Dresden 01328, Germany
3. Department of Structure and Function of Proteins, Helmholtz Centre for Infection Research, Braunschweig 38124, Germany
4. Helmholtz Centre for Infection Research and Department of Pharmacy at Saarland University, Helmholtz Institute for Pharmaceutical Research Saarland, Saarbrücken 66123, Germany
5. Department of Applied Physics, Aalto University, PO Box 14100, Aalto 00076, Finland