Figure 15.1 A simple node-and-edge graph R code	Figure 15.2 A simple GXL file R code	Figure 15.3 Rendering a graph with Rgraphviz R code	Figure 15.4 Modifying graph attributes R code
Figure 15.5 Customized graph rendering R code	Figure 15.6 Rendering with graphviz R code	Figure 15.7 A simple hypergraph R code	Figure 15.8 Some regular graphs R code
Figure 15.9 A simple network R code	Figure 15.10 A flow chart R code