1. Centre for Materials Physics, Durham University, Durham, DH1 3LE United Kingdom
2. Diamond Light Source, Didcot, OX11 0DE United Kingdom
3. School of Physics and Astronomy, University of Exeter, Exeter, EX4 4QL United Kingdom
4. Synchrotron SOLEIL, Saint Aubin, BP 48, 91192 Gif-sur-Yvette, France
5. Department of Physics, University of Warwick, Coventry, CV4 7AL United Kingdom