[1] Jt. Inst. for Lab. Astrophysics, Boulder, CO 80309-0440, United States
[2] Computing Sciences Division, Lawrence Berkeley Natl. Laboratory, Berkeley, CA 94720, United States
[3] Physics Directorate, Lawrence Livermore Natl. Laboratory, Livermore, CA 94550, United States
[4] Department of Applied Science, University of California, Livermore, CA 94550, United States