# http://www.graphviz.org/content/cluster digraph G { layout = neato; Asymptomatic [pos="0,0!"]; "Progressive\nDisease" [pos="2,1!"]; Dead [pos="1,-1!"] Asymptomatic -> Asymptomatic ; "Progressive\nDisease" -> "Progressive\nDisease"; Asymptomatic -> "Progressive\nDisease" [label="tpProg * (1-effect)"]; "Progressive\nDisease" -> Dead [label=" tpDcm+tpDn" fontcolor="black"]; Asymptomatic -> Dead [label="tpDn"]; Dead -> Dead ; }