1. Institute of Physics, Warsaw University Branch, ul. Lipowa 41, 15-424 Bialystok, Poland
2. Department of Physics, University of Warwick, Coventry CV4 7AL, UK
3. Department of Applied Physics, University of Portsmouth, Portsmouth PO1 2DZ, UK
4. Department of Electrical and Electronic Engineering, Gunma University, Kiryu 376
5. The Institute for Physical and Chemical Research (RIKEN), Wako 351-01
6. Faculty of Science, Himeji Institute of Technology, Kanaji 1479-1, Kamigori, Hyogo 678-12
7. Photon Factory, KEK, Oho, Tsukuba 305
8. The ESRF, Grenoble 38043 Cedex, France