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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 *τ*_{min}) 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 *μ*_{1,0}=1. Each cell, intersection of a column with value *c* and a row with value *f*, contains the minimum mission time (*τ*_{min}) 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 *τ*_{min} is not trivially 0 for any *c*). Values *τ*_{min} are highlighted in slightly larger font-size if the respective *c* starts before some *τ* smaller than 1. *τ*_{min} is 0^{+} whenever *c*≤*f*+1