1. Deutsches Elektronen–Synchrotron (DESY), 22607 Hamburg, Germany
2. Max Planck Institute for Nuclear Physics, 69117 Heidelberg, Germany
3. SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
4. Center for Free-Electron Laser Science, DESY, 22607 Hamburg, Germany
5. Center for Ultrafast Imaging, University of Hamburg, 22761 Hamburg, Germany
6. J.R. Macdonald Laboratory, Kansas State University, Manhattan, Kansas 66506, USA
7. Max Planck Institute for Medical Research, 69120 Heidelberg, Germany
8. Department of Physics, University of Hamburg, 22761 Hamburg, Germany
9. Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7614, Laboratoire de Chimie Physique–Matiere et Rayonnement, F-75005 Paris, France
10. Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
11. Extreme Light Infrastructure – Nuclear Physics, Horia Hulubei National Institute for Physics and Nuclear Engineering, RO-077125 Magurele, Jud. Ilfov, Romania
12. Molecular Materials Research Community, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland
13. Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
14. Institute of X-ray Physics, University of Göttingen, 37077 Göttingen, Germany
15. IMRAM, Tohoku University, 980-8577 Sendai, Japan
16. Argonne National Laboratory, Lemont, Illinois 60439, USA
17. Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA