X-ray powder diffraction patterns of liquid TMS at pressures of (a) 4.2, (b) 6.5, (c) 9.9, and (d) 19.8 GPa, respectively. The refined lattice parameters for the corresponding space groups are given, respectively. The open circles represent the measured intensities and the red lines represent the results of profile refinements by the best LeBail-fit with each space group. The positions of the Bragg reflections are marked by vertical lines Pnma is shown as green and P2₁/c is shown as purple in panel (b) and the difference profiles are shown at the bottoms (blue lines).