1. Seismological Laboratory, Division of Geological and Planetary Sciences; California Institute of Technology; Pasadena California USA
2. Now at COMPRES Technology Center; Argonne Illinois USA
3. Advanced Photon Source; Argonne National Laboratory; Argonne Illinois USA
4. Advanced Light Source; Lawrence Berkeley National Laboratory; Berkeley California USA
5. Centre National de la Recherche Scientifique, Université de Lyon, Université Claude Bernard Lyon 1, Ecole Normale Supérieure de Lyon; Lyon France