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c_r\phi = 2.71 \cdot \phi_i^{-0.415} \cdot 10^{-7} \ \textrm{kpa}^{-1}

c_r\phi = 1.45 \cdot \exp \big[ 4.026 - 23.07 \ \phi_i + 44.28 \ \phi_i^2   \big] \cdot 10^{-7} \ \textrm{kpa}^{-1}

c_r\phi = 1.45 \cdot \exp \big[ 5.118 - 32.26 \ \phi_i + 63.98 \ \phi_i^2   \big] \cdot 10^{-7} \ \textrm{kpa}^{-1}

c_r\phi = 1.45 \cdot \exp \big[ 34.012 \cdot ( \phi_i - 0.2)  \big] \cdot 10^{-7} \ \textrm{kpa}^{-1}