1. SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
2. Department of Physics, Stanford University, Stanford, California 94305, United States
3. Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
4. X-ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
5. Univ Rennes, CNRS, IPR (Institut de Physique de Rennes)─UMR 6251, 35000 Rennes, France