digraph third {
  graph [outputorder=edgesfirst bgcolor=transparent];
  node [style=filled fillcolor=white];
  edge [tailclip=false];
  rankdir=LR
  reactor -> radiator [color=orange penwidth=0 style="invis"];
  reactor -> generator [color=red penwidth=0 style="invis"];
  generator -> radiator [color=orange penwidth=0 style="invis"];
  radiator -> space [color=forestgreen penwidth=8];
  generator -> "science lab" [color=blue penwidth=0 style="invis"];
  "science lab" -> radiator [color=orange penwidth=0 style="invis"];
  reactor -> "thermal nozzle" [color=red penwidth=24];
  "thermal nozzle" -> radiator [color=orange penwidth=8];
  "thermal nozzle" -> space [color=forestgreen penwidth=16];
}