1. Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
2. Institute of Physics, University of Freiburg, 79104 Freiburg im Breisgau, Germany
3. Sorbonne Université, CNRS, Laboratoire de Chimie Physique Matière et Rayonnement, 75005 Paris, France
4. Elettra-Sincrotrone Trieste S.C.p.A., 34149 Basovizza TS, Italy
5. Department of Physics, University of Gothenburg, 41133 Gothenburg, Sweden