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Brillouin scattering spectra of MgO at 54.7 GPa. VL(s) and VT(s) are the longitudinal and transverse sound velocities, respectively, for the sample. R and D are the Rayleigh and diamond peaks, respectively. The longitudinal peaks of the helium medium, which were very close to the sample peaks, can be subtracted by control measurements on the pure helium (area of the gasket hole without the sample).
