1. University of Groningen, Zernike Institute for Advanced Materials, Nijenborgh 4, 9747AG Groningen, Netherlands
2. University College Groningen, Hoendiep 23/24, 9718BG Groningen, Netherlands
3. Universität Potsdam, Institut für Physik und Astronomie, 14476 Potsdam, Germany
4. Centre for Free Electron Lasers (CFEL), DESY, Notkestraße 85, 22607 Hamburg, Germany
5. CIMAP UMR 6252 (CEA/CNRS/ENSICAEN/Université de Caen Normandie), Boulevard Becquerel, 14070 Caen Cedex 5, France