{
  node_height = 160;
  node_width = 160;
  span_width = 32;
  span_height = 32;
  default_fontsize = 16;
  default_fontfamily = 'serif';
  default_network_color = red;
  default_textcolor = red;
  default_linecolor = red;

  network {
    A;
  }
}
