1. Department of Physics Imperial College London, Exhibition Rd, South Kensington London SW7 2AZ UK
2. Department of Materials Science and Engineering Stanford University 450 Serra Mall Stanford CA 94305 USA
3. Physical Sciences and Engineering Division, KAUST Solar Center King Abdullah University of Science and Technology (KAUST) Thuwal 23955 Saudi Arabia
4. Structural biology of cells and viruses laboratory The Francis Crick Institute 1 Midland Road London NW1 1AT UK
5. Chemical Crystallography Laboratory Department of Chemistry Imperial College London White City Campus 82 Wood Lane London W12 0BZ UK
6. Department of Chemistry University of Oxford Oxford OX1 2JD UK