1. Hopkins Extreme Material Institute, Johns Hopkins University, Baltimore, Maryland 21218, USA
2. Lawrence Livermore National Laboratory, Livermore, California 94550, USA
3. Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21210, USA
4. Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
5. Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
6. Department of Geosciences, Princeton University, Princeton, New Jersey 08544, USA