1. Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.
2. Center for Free Electron Laser Science, Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany.
3. Department of Physics, Arizona State University, Tempe, AZ 85287, USA.
4. School of Medicine and School of Biochemistry and Immunology, Trinity College, Dublin, Dublin 2, Ireland.
5. SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.
6. Laboratory of Molecular Biophysics, Department of Cell and Molecular Biology, Uppsala University, Husargatan 3, Box 596, SE-751 24 Uppsala, Sweden.
7. Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287, USA.
8. Department of Physics, University of Hamburg, 22761 Hamburg, Germany.
9. Center for Ultrafast Imaging, 22607 Hamburg, Germany.