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. 2024 Sep 30;7:220. doi: 10.1038/s42004-024-01309-w

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© The Author(s) 2024, corrected publication 2025

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Fig. 4 — Top panels: measured (a) lattice mode, (b) bending region and (c) stretching region. The shaded areas highlight the III to IIIt phase transition then the IIIt to VIII phase transition at higher pressure. Lower panels: theoretical (a’) lattice mode, (b’) bending region and (c’) stretching region. The size of the dots is given by the intensity of the Raman peaks.