1. Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science, Luruper Chaussee 149, Hamburg 22761, Germany
2. The Hamburg Center for Ultrafast Imaging, Luruper Chaussee 149, Hamburg 22761, Germany
3. Center for Computational Quantum Physics, Flatiron Institute, 162 Fifth Avenue, New York, New York 10010, United States
4. Nano-Bio Spectroscopy Group, University of the Basque Country (UPV/EHU), San Sebastián 20018, Spain