This work was funded by the Science and Technology Facilities Council (grants ST/H002472/1, ST/H002960/1 and ST/K000918/1 to D.F.M. and M.R.L.) and the NASA Mars Fundamental Research Program (grant NNH14AX56I to W.S.C.). Portions of this work were performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
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