1. Department of Physics, University of California, Berkeley Berkeley, CA 94720.
2. Lawrence Livermore National Laboratory, Livermore, CA 94550.
3. Center for X-Ray Optics, Lawrence Berkeley Laboratory, Berkeley, CA 94720.
4. Division of Molecular Cytometry, University of California at San Francisco, San Francisco, CA 94143.
5. IBM T. J. Watson Research Center, Yorktown Heights, NY 10598.