W. H. de Vries (1,2), J. A. Hodge (1), R. H. Becker (1,2), R. L. White
  (3), and D. J. Helfand (4)((1) University of California, Davis, (2) IGPP,
  Lawrence Livermore National Laboratory, Livermore,(3) Space Telescope Science
  Institute, Baltimore, (4) Columbia University, New York)