1. Photon Science Division, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
2. Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, 2800 Kgs. Lyngby, Denmark
3. Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
4. Institut de Physique, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
5. Departamento de Física, Universidade Federal de Minas Gerais, C.P. 702, 30123-970 Belo Horizonte, Minas Gerais, Brazil