1. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
2. IBI-4, Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
3. Laboratory for Soft Matter and Biophysics, KU Leuven, B-3001 Leuven, Belgium
4. X-Ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
5. Department of Chemical and Biomolecular Engineering, University of Illinois Urbana-Champaign, Champaign, Illinois 61801, USA