1. Department of Materials, University of Manchester, ManchesterM13 9PL, U.K.
2. SuperSTEM Laboratory, STFC Daresbury Campus, DaresburyWA4 4AD, U.K.
3. Department of Physics, University of York, YorkYO10 5DD, U.K.
4. School of Mechanical Engineering Sciences, University of Surrey, Guildford, Surrey GU2 7XH, U.K.
5. Photon Science Institute, University of Manchester, ManchesterM13 9PL, U.K.
6. Henry Royce Institute, University of Manchester, ManchesterM13 9PL, U.K.
7. School of Chemical and Process Engineering and School of Physics and Astronomy, University of Leeds, LeedsLS2 9JT, U.K.