Hugoniot curve for the different fits compared to the results from ANEOS (Collins & Melosh 2014). The experimental data show a sharp change at around which correlates to the high pressure phase change from quartz to stishovite. ANEOS can be seen to capture this phase transition quite well, while our one phase EOS struggle to fit the experimental data in this region. The experimental data is fromTrunin et al. (1971) and Wackerle (1962).