Figure 3
![Figure 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1471-2105-9-344/MediaObjects/12859_2008_Article_2329_Fig3_HTML.jpg)
Comparison of EPO, EPO-NoMerge and POA. Distribution of aligned nodes produced by the EPO algorithm, EPO-NoMerge (i.e, first stage of the EPO algorithm), and the traditional POA algorithm. The histogram is the number of aligned nodes (y-axis) versus the size of aligned nodes (x-axis).