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Table 7 Gumbel law parameters λ and K for different alphabets, obtained with the corresponding RE BLOSUM score matrices.

From: Optimal neighborhood indexing for protein similarity search

alphabets λ K
Σ20 × Σ20 0.320 0.139
Σ20 × Σ16 0.333 0.143
Σ20 × Σ8 0.223 0.142
Σ20 × Σ4 0.212 0.128
Σ20 × Σ2 0.161 0.101
  1. RE BLOSUM 62 matrix for alphabet Σ20 × Σ2. Scores located on the "diagonal" are shown in bold.