1. Biological Physics Laboratory, Department of Physics and Astronomy, Faculty of Science and Engineering, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
2. Division of Pharmacy and Optometry, Faculty of Biology, Medicine and Health, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
3. STFC ISIS Facility, Rutherford Appleton Laboratory, Didcot OX11 0QX, U.K.
4. Institute of Laue Langevin, 71 Avenue des Martyrs, CS-20156, Grenoble 38042, France