Delaunay tessellation of a protein in 2D. The dots represent amino acids, and the thick solid line connecting the dots is the backbone. Dotted lines are Delaunay triangles and thin solid lines represent the Voronoi cells. The four shaded edges illustrate the four degrees of buriedness for two body contacts (see Section on Delaunay Buriedness of Contacts). These edges are named e
, for b = 0, 1, 2, 3 as shown in Figure 3.