1. SuperSTEM Laboratory, SciTech Daresbury Campus, Keckwick Lane, Daresbury WA4 4AD, UK.
2. Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.
3. Physics, School of Science, RMIT University, Melbourne, Victoria 3001, Australia.
4. Nion Company, 11511 NE 118th Street, Kirkland, WA 98034, USA.
5. Department of Physics, Arizona State University, Tempe, AZ 85287, USA.
6. STFC (Science & Technology Facilities Council) Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot OX11 0QX, UK.
7. Department of Physics, Royal Holloway, University of London, Egham TW20 0EX, UK.
8. School of Physics, University of Leeds, Leeds LS2 9JT, UK.
9. School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK.