Barbara Buades1, Iker Leon1, Nicola DiPalo1, Daniel Rivas1,2, Themistoklis P.H. Sidiropoulos1, Stefano Severino1, Maurizio Reduzzi1, Seth Cousin1, Michael Hemmer1, Claudia Cocchi3, Eric Pellegrin4, Javier Herrero4, Samuel Manas5, Eugenio Coronado5, Thomas Danz6, Claudia Draxl3, Mitsuharu Uemoto7, Kazuhiro Yabana7, Martin Schultze8, Simon Wall1, Antonio Picon1,9, *Jens Biegert1,10
(1. ICFO - The Institute of Photonic Sciences, 2. European XFEL GmbH, 3. Humboldt-Universität, 4. ALBA Synchrotron Light Source, , 5. Universitat de València, 6. University of Göttingen, 7. University of Tsukuba, 8. Ludwig-Maximilians- Universität, 9. Universidad Autónoma de Madrid, 10. ICREA)