up to 115 GPa and 1600 K by NIS.
12• Negligible anharmonic contributions to sound velocities validate the extrapola-13 tion of Birch's law to CMB conditions.
14• Less than 8.4 vol% B2-FeSi produced by core-mantle reactions are enough to 15 explain the seismic anomalies associated with the ULVZs.
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