Figure 6

Extended ε -core. An ε-match extended by one error column and match columns, is still an ε-match. Therefore, an ε-core should include such an extension, since all maximal ε-matches at this location will include it. In this example where ε = 0.1 and n₀ = 20 we see an error-free segment of length 7 ≥ 6 = s^min that can be extended to an ε-core of length 19 including one error.