Figure 1. Anchor coalescing.

Here we illustrate an example of how anchor coalescing is processed. In A we show 3 anchors spanning 3 sequences represented by 3 sets of arrows: red, green, and blue. The green anchor overlaps the red anchor in all sequences, and maintains colinearity, therefore they can be coalesced. However the overlap of green and blue occurs only in Sequence 1, therefore they cannot be coalesced. B shows the results of the coalescing of green and red with the resulting anchor shown in yellow.