[1] Max Planck Adv Study Grp CFEL, D-22607 Hamburg, Germany
[2] DESY, D-22607 Hamburg, Germany
[3] Max Planck Inst Med Res, D-69120 Heidelberg, Germany
[4] Max Planck Inst Nucl Phys, D-69117 Heidelberg, Germany
[5] Tech Univ Berlin, D-10623 Berlin, Germany
[6] DESY, Ctr Free Electron Laser Sci, D-22607 Hamburg, Germany
[7] European Xray Free Electron Laser XFEL GmbH, D-22761 Hamburg, Germany
[8] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA
[9] Univ Hamburg, Dept Phys, D-22761 Hamburg, Germany
[10] Univ Hamburg, Hamburg Ctr Ultrafast Imaging, D-22761 Hamburg, Germany
[11] Univ Trieste, Dipartimento Sci Chim & Farmaceut, I-34127 Trieste, Italy
[12] Max Planck Inst Struct & Dynam Matter, D-22607 Hamburg, Germany
[13] Fritz Haber Inst MPG, D-14195 Berlin, Germany
[14] Aarhus Univ, DK-8000 Aarhus C, Denmark
[15] Lund Univ, Dept Phys, S-22100 Lund, Sweden
[16] Max Planck Inst Biophys Chem, D-37077 Gottingen, Germany
[17] Max Born Inst, D-12489 Berlin, Germany
[18] FOM Inst AMOLF, NL-1098 XG Amsterdam, Netherlands
[19] Phys Tech Bundesanstalt, D-38116 Braunschweig, Germany
[20] Univ Gottingen, Inst Xray Phys, D-37077 Gottingen, Germany
[21] Kansas State Univ, JR Macdonald Lab, Manhattan, KS 66506 USA