1. Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom
2. Electron
Physical Sciences Imaging Centre, Diamond Lightsource Ltd, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
3. JEOL UK Ltd., Silver Court
Watchmead, Welwyn Garden City, Hertfordshire AL7 1LT, United Kingdom
4. Department
of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States