Alcodens-2.1 Here

[ \rho_t = \rho_15 \cdot \exp[-\alpha_15(t-15)(1 + 0.8\alpha_15(t-15))] ]

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[ \rho_t = \rho_15 \cdot \exp[-\alpha_15(t-15)(1 + 0.8\alpha_15(t-15))] ]