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Table 3 Time periods (τ) with relative-resilience (c) under sequential attack (). Each row corresponds to a different intrusion tolerance threshold f, for which any 〈n,f〉 system with n>f applies. Each column (below the top merged cell defining τmin) corresponds to a specific relative-resilience factor c. τ is a measure of time normalized to the ETTF of the reference system 〈1,0〉, i.e., such that μ1,0=1. Each cell, intersection of a column with value c and a row with value f, contains the minimum mission time (τmin) for which the relative-resilience of the 〈n,f〉 configuration is at least c. 0+ indicates that any positive value of mission time satisfies the condition of relative-resilience higher than c (note that the comparison operation is > and not ≥, so that τmin is not trivially 0 for any c). Values τmin are highlighted in slightly larger font-size if the respective c starts before some τ smaller than 1. τmin is 0+ whenever cf+1

From: On the reliability and availability of replicated and rejuvenating systems under stealth attacks and intrusions