eg T-Tree.dot

digraph structs {
	node [shape=record];
	
	struct1 [shape=record, label="{ { |  |  | } | { <left> . | <right> . }}"];
	struct2 [shape=record, label="{ { |  |  | } | { <left> . | <right> . }}"];
	struct3 [shape=record, label="{ { |  |  | } | { <left> . | <right> . }}"];
	
	"struct1":right -> "struct3"
	"struct1":left -> "struct2"
}