1. R. Lieu, Department of Physics, University of Alabama, Huntsville, AL 35899, USA.
2. J. P. D. Mittaz, Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK.
3. S. Bowyer and C.-y. Hwang, Center for Extreme Ultraviolet Astrophysics, University of California, Berkeley, CA 94720, USA.
4. J. O. Breen and E. M. Murphy, Astronomy Department, University of Virginia, Post Office Box 3818, Charlottesville, VA 22903, USA.
5. F. J. Lockman, National Radio Astronomy Observatory, Green Bank, WV 24944, USA.