A simple example using the output of COSI. A simple example using the output of COSI, where the horizontal line corresponds to the age or depth of the node that it intersects. Also, the length of each edge is not proportional to the size in the rendering. For instance the length of edge AB is 34.163732 while length of BD is only 7.645987, while they have been rendered here with the same size. (a) The topology of the ARG: node D is not t-coalescent. (b) The ARG in (a) after removal of node D. (c) The ARG in (b) after removal of chain node E. (d) The ARG in (c) after removal of chain node B.