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. 2016 Apr 26;6:24852. doi: 10.1038/srep24852

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Evolution of D_c as a function of the effective normal stress, σ’_n, and pore fluid factor λ. Marble gouge at 19 MPa (a) and 30 MPa (b) of confining pressure, P_c. Limestone gouge at 19 MPa (c) of confining pressure.