1. Solid State Physics, Lund University, Box 118, Lund 22100, Sweden
2. Department of Physics, Chalmers University of Technology, Gothenburg 41296, Sweden
3. SuperSTEM Laboratory, SciTech Daresbury Campus, Daresbury WA4 4AD, UK
4. Department of Materials, University of Oxford, Oxford OX1 3PH, UK
5. Department of Physics/Centre for Materials Science and Nanotechnology, University of Oslo, Oslo 0318, Norway
6. Institute of Physics, Humboldt University of Berlin, Berlin 12489, Germany
7. School of Chemical and Process Engineering and School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK
8. Centre for Analysis and Synthesis, Lund University, Box 124, Lund 22100, Sweden