1. Advanced Light Source (ALS),
2. Department of Physics, Department of Applied Physics, and Stanford Synchrotron Radiation Laboratory (SSRL), Stanford University, Stanford, CA 94305, USA.
3. Laboratoire de Physique des Solides, CNRS, UMR8502, Universite Paris-Sud, Bat 510, 91405 Orsay, France.
4. Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA.
5. Materials Science Division, Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA 94720, USA.
6. Sincrotrone Trieste S.C.p.A., S.S. 14 Km 163.5, in Area Science Park, 34012 Trieste, Italy.
7. Istituto Nazionale per la Fisica della Materia–Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, Via dei Musei 41, 25121 Brescia, Italy.