1. S. K. Saxena, L. S. Dubrovinsky, P. Lazor, Y. Cerenius, P. Häggkvist, Theoretical Geochemistry, Institute of Earth Sciences, Uppsala University, S-752 36 Uppsala, Sweden.
2. M. Hanfland, European Synchrotron Radiation Facility, Boite Postale 220, Avenue des Martyrs, 38043 Grenoble Cedex, France.
3. J. Hu, Center for High Pressure Research, Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, USA.