Table 4

Correction parameter λ₂ for the sum statistics k = 2 and k = 3. λ₂ is estimated by a fit for Eq. (21) using optimal the Gumbel-parameters λ and S₀ from optimal score statistics (k = 1). BLOSUM62 with affine gap costs (α = 12, β = 1) was used as scoring system.

L

10⁴

10⁴

60

2.692 ± 0.30%

80

1.631 ± 0.63%

1.074 ± 2.59%

100

1.488 ± 0.23%

0.649 ± 2.06%

150

1.056 ± 0.06%

0.344 ± 1.90%

200

0.749 ± 0.13%

0.280 ± 1.14%

300

0.463 ± 0.15%

0.189 ± 0.70%

400

0.338 ± 0.29%

0.139 ± 0.92%

Wolfsheimer et al. Algorithms for Molecular Biology 2007 2:9   doi:10.1186/1748-7188-2-9