<figure xmlns="http://www.tei-c.org/ns/1.0"> <graphic url="143_final-d192d8e5d1b7cdec95698afe9412a677.png" /> <head> <lb />Figure 1. Detection of root from an unrooted tree (I, left) with an underlying rooted one (right). For each leaf on each path to another leaf, the node of direction change is detected and marked,here with <hi rend="color(#424242)">◇ </hi>(II, <hi rend="bold">A</hi>-C and <hi rend="bold">A</hi>-D exemplarily). For each leaf separately, the <hi rend="color(#424242)">◇</hi> furthest away from it is chosen and if direction change detection works 100 %, all nodes converge on true root (III). </head> </figure>