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Ratio when the instability starts at tδ = 60 days after the beginning of treatment. The parameters are the asymptotic mass, M∞ = 640 g, M (0) = 6.4 g, M2 (t∞ = M1 (tδ)10-1, M1∞ M∞, ω = 0.1 per month and Kg = 0.055 per month. Different values for the ratio between K1 and K2 are depicted.