1. Deutsches Elektronen-Synchrotron, Notkestraße 85, 22607 Hamburg, Germany
2. PULSE at Stanford, 2575 Sand Hill Road, Menlo Park, California 94025, USA
3. Institut für Physik, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
4. SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
5. European XFEL GmbH, Albert-Einstein-Ring 19, 22761 Hamburg, Germany
6. Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119991, Russia
7. Departamento de Fisica de Materiales, UPV/EHU, Donostia International Physics Center (DIPC), E-20018 San Sebastian/Donostia, Spain