1. Department of Physics, University of Wisconsin–Milwaukee, Milwaukee, WI 53211, USA.
2. Center for Free Electron Laser Science, Deutsches Elektronen Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany.
3. Faculty of Natural Sciences, Department of Life Sciences, Imperial College, London SW7 2AZ, UK.
4. Nanoscience Center and Department of Chemistry, University of Jyväskylä, Post Office Box 35, 40014 Jyväskylä, Finland.
5. Linac Coherent Light Source, SLAC National Accelerator Laboratory, Sand Hill Road, Menlo Park, CA 94025, USA.
6. School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Arizona State University, Tempe, AZ 85287, USA.
7. Department of Physics, Arizona State University, Tempe, AZ 85287, USA.
8. IMPRS-UFAST, Max Planck Institute for Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.
9. Hauptman-Woodward Institute, State University of New York at Buffalo, 700 Ellicott Street, Buffalo, NY 14203, USA.
10. Center for Advanced Radiation Sources, University of Chicago, Chicago, IL 60637, USA.
11. Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
12. Center for Ultrafast Imaging, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
13. Department of Biochemistry and Molecular Biology and Institute for Biophysical Dynamics, University of Chicago, Chicago, IL 60637, USA.