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. 2017 Nov 28;7:16526. doi: 10.1038/s41598-017-16733-3

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© The Author(s) 2017

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Left: Total spin momentum S as a function of pressure for all the spectra shown in Fig. 2. The grey shaded area (40–46 GPa) represents the coexistence regime of high- and low-spin iron revealed by Spivak et al.³⁵. Right: Photographs of the siderite sample and ruby sphere position in the sample chamber for measurements with argon in the LS state and for measurements with helium in the LS and HS state.