FIGURE 2. (a) Diffraction patterns from Sample 2 at 93 GPa. The diffraction is from the KBr pressure medium, from MgSiO₃-perovskite, and from post-perovskite-like material. In any case, the diffraction features are Debye fringes from a powdered material with minor granularity. (b) Sample 1 at 115 GPa. This sample exhibits noticeable texture in a fine-grained sample aggregate. The intensity distribution is therefore not homogeneous along each Debye fringe but modulated. Another obvious consequence of texture is the alternating sequence of sections of enhanced and oppressed diffraction intensity along the sequence of 2 angles of observed diffraction.