Figure 2

Two different labeling for the alignment of strings A ="abcde", X ="acdeabdeabde" and Y ="acde". Losses are denoted by "L" and duplications by arrows from source (indicated by bracket) to target. In the left labeling, "a₂b₁d₂e₂" is interpreted as the target of a duplication. In the right one, it is interpreted in $\mathcal{L}\left(\overline{X},Ȳ\right)$ as a loss, and in $\mathcal{L}\left(Ā,\overline{X}\right)$ as 2 duplications.