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We further measure the SdH oscillations under pressure. At 13 kbar, we detected a peak at 1798 T with m^*=2.86m_e. Relative to the oscillation data at a lower pressure, the amplitude of this peak experienced an enhancement, which can be attributed to the reduced curvature of the hole pockets under pressure. Combining our experimental data with DFT+U calculations, where U is the Hubbard parameter, our results shed light on why these important hole pockets have not been detected until now.We have produced hard x-ray free-electron laser (