Why this differs from similar rows:
Table I cites Ref. 9 (Jackson & Niesler), ultrasonic measurements only to 3 GPa; sibling row cites a different study (Ref. 10) measured to 7.8 GPa under nonhydrostatic conditions.
Why this differs from similar rows:
Table I cites Ref. 10 (Yoneda), ultrasonic to 7.8 GPa under nonhydrostatic conditions (may bias K'); sibling row cites Ref. 9 to only 3 GPa.