1. Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark
2. Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607 Hamburg, Germany
3. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe shosse 31, 115409 Moscow, Russia
4. European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany
5. Department of Chemistry, Technical University of Denmark, DK-2800 Lyngby, Denmark
6. PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA