fprintf(file," graph [overlap=scale]\n");
fprintf(file," node [shape=box, style=filled]\n");
fprintf(file," node [width=.3, height=.3, style=filled, color=skyblue]\n\n");
xbt_dynar_foreach(g->nodes, cursor, node) {
fprintf(file," graph [overlap=scale]\n");
fprintf(file," node [shape=box, style=filled]\n");
fprintf(file," node [width=.3, height=.3, style=filled, color=skyblue]\n\n");
xbt_dynar_foreach(g->nodes, cursor, node) {