1. Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
2. European XFEL, Holzkoppel 4, DE-22869 Schenefeld, Germany
3. Department of Applied Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
4. School of Science, RMIT University, Melbourne, Victoria 3000, Australia
5. Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, U.K.
6. Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
7. Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron, Notkestraße 85, DE-22607 Hamburg, Germany