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. 2000 Nov 28;97(25):13494–13499. doi: 10.1073/pnas.240466697

Figure 6.

Figure 6

Comparison of ruby fluorescence frequency shifts under different stress calibrations. The solid curve is the primary pressure scale from this study. Other curves are previous calibrations based on shock-wave equations of state of metals (27, 28) and extrapolation of the diamond Raman shift (41).