1. DESY, Notkestr. 85, Hamburg 22607, Germany
2. European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany
3. Institute of Nanostructure and Solid State Physics, University of Hamburg and Center for Free-Electron Laser Science (CFEL), Notkestr. 85, Hamburg 22607, Germany
4. Sorbonne Université, CNRS (UMR 7614), Laboratoire de Chimie Physique-Matière et Rayonnement, 4 Place Jussieu, 75252 Paris Cedex 05, France
5. Physics Department, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
6. Helmholtz Zentrum Berlin, Department Optics and Beamlines, Albert-Einstein-Strasse 15, 12489 Berlin, Germany