Figure 3

Visualization of graph G2 with non-tree structure. Graph G2 drawn using dot layout (left) and the Enhanced Radial Space-Filling (ERSF) layout in MetNetGE using structure-based coloring (right). In the dot layout, green dashed lines represent non-tree edges. In the ERSF layout, yellow orbits with green and blue links represent non-tree relations. For example, the green line extruded from C contains two red-dots: the inner one intersects with orbit of AA1 and the outer one intersects with orbit of AA2. These orbits mean that C is the minor parent of both AA1 and AA2.