Could you provide some details on the algorithm used to graph the plots? I'm pretty sure nothing in graphviz would result in such nice looking graphs, so probab

Could you provide some details on the algorithm used to graph the plots? I'm pretty sure nothing in graphviz would result in such nice looking graphs, so probably not a spring relaxation-type algorithm. Perhaps something using the graph Laplacian eigenvectors? I recall some papers by Yehuda Koren using the technique on massive graphs