digraph G { subgraph cluster_team_leaders { style = filled; /* defines the cluster */ color = lightgrey; label = "Team leaders"; Guido [shape = plaintext]; /* defines the elements in the cluster */ Iznogood [shape = plaintext]; Floris [shape = plaintext]; Guus [shape = plaintext]; Unknown [shape = plaintext, label = "?"]; } subgraph cluster_authors { style = filled; color = blue; label = "Authors"; JeanEtienne [shape = plaintext, label = "Jean-Etienne"]; John [shape = plaintext]; Gunter [shape = plaintext, label = "Günter"]; Laurent [shape = plaintext]; } EditorInChief [label = "Editor in chief"]; FrenchTeam [label = "French Team"]; DutchTeam [label = "Dutch Team"]; ContactPersonForEnglish [label = "Contact Person for English"]; GermanTeam [label = "German Team"]; EditorInChief -> Guido; EditorInChief -> FrenchTeam; EditorInChief -> DutchTeam; EditorInChief -> ContactPersonForEnglish; EditorInChief -> GermanTeam; FrenchTeam -> Iznogood; DutchTeam -> Floris; DutchTeam -> Guus; ContactPersonForEnglish -> Guido; GermanTeam -> Unknown; Guido -> John; Unknown -> Gunter; Iznogood -> Laurent; Guido -> JeanEtienne; Iznogood -> JeanEtienne; }