1. Lawrence Livermore National Laboratory, 6000 East Avenue, Livermore, California 94500, USA
2. University of Oxford, Oxford OX1 3PU, United Kingdom
3. Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA
4. Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
5. Stanford Institute for Materials and Energy Sciences, SLAC, Menlo Park, California 94025, USA
6. Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
7. SUPA, School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh EH9 3FD, United Kingdom