1. Constraints on Earth’s inner core composition inferred from measurements of the sound velocity of hcp-iron in extreme conditions by Tatsuya Sakamaki, Eiji Ohtani, Hiroshi Fukui, Seiji Kamada, Suguru Takahashi, Takanori Sakairi, Akihiro Takahata, Takeshi Sakai, Satoshi Tsutsui, Daisuke Ishikawa, Rei Shiraishi, Yusuke Seto, Taku Tsuchiya, and Alfred Q. R. Baron Science Volume 2(2):e1500802 February 26, 2016 Published by AAAS

2. Fig. 1 IXS spectrum of hcp-Fe at 163 GPa and 3000 K. Tatsuya Sakamaki et al. Sci Adv 2016;2:e1500802 Published by AAAS

3. Fig. 2 Compressional velocity of hcp-Fe at several temperatures as a function of density. Tatsuya Sakamaki et al. Sci Adv 2016;2:e1500802 Published by AAAS

4. Fig. 3 Comparison of the ρ-VP plot between hcp-Fe under ICB conditions and PREM. Tatsuya Sakamaki et al. Sci Adv 2016;2:e1500802 Published by AAAS

5. Fig. 4 Comparison of the ρ-VP plot between hcp-Fe and Fe–light element compounds. Tatsuya Sakamaki et al. Sci Adv 2016;2:e1500802 Published by AAAS