1. Department of Physics, King's College London, The Strand, London, WC2R 2LS, UK
2. Centre for Ultrastructural Imaging, King's College London, New Hunt's House, London, SE1 1UL, UK
3. The Photon Science Institute, School of Physics and Astronomy, University of Manchester, Schuster Building, Oxford Road, Manchester, M13 9PL, UK
4. Department of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
5. MAX IV Laboratory, Lund University, Box 118, 221 00 Lund, Sweden