1. Bayerisches Geoinstitut; Universität Bayreuth; Bayreuth Germany
2. Department of Earth Sciences; University of Oxford; Oxford UK
3. Deutsches GeoForschungsZentrum; Potsdam Germany
4. Deutsches Elektronen-Synchrotron (DESY); Hamburg Germany
5. Now at Laboratory for Materials and Structures; Tokyo Institute of Technology; Yokohama Japan
6. European Synchrotron Radiation Facility; Grenoble France