1. Department of Physics and Astronomy, Vrije Universiteit Amsterdam, De Boelelaan, Amsterdam 1081 HV, The Netherlands
2. Institut für Biologie, Experimentelle Biophysik, Humboldt Universität zu Berlin, Invalidenstrasse 42, D-10115 Berlin, Germany
3. ELI-Beamlines, Institute of Physics, Na Slovance 2, 182 21 Praha 8, Czech Republic