1. Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany
2. Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
3. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
4. Department of Physics, University of California, Berkeley, California 94720, USA
5. Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
6. SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
7. Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
8. Institut für Physik, Universität Rostock, 18051 Rostock, Germany
9. The Hamburg Centre for Ultrafast Imaging CUI, Luruper Chaussee 149, 22761 Hamburg, Germany
10. European XFEL GmbH, Albert-Einstein-Ring 19, 22761 Hamburg, Germany