digraph fig7 { node [shape=rect] edge [dir=none] subgraph compound1 { a [label="LFILE"] b [label="*\rLREC"] c [label="o\rMATCHED LREC"] d [label="o\rUNMATCHED LREC"] a -> {b} b -> {c d} } subgraph compound2 { e [label="RFILE"] f [label="*\rRREC"] g [label="o\rMATCHED RREC"] h [label="o\rUNMATCHED RREC"] e -> {f} f -> {g h} } subgraph compound3 { i [label="REPORT"] j [label="*\rLINE"] k [label="o\rTYPE 1"] l [label="o\rTYPE 2"] m [label="o\rTYPE 3"] n [label="o\rTYPE 4"] i -> {j} j -> {k l m n} } {rank=same a e i} {rank=same b f j} {rank=same c d g h k l m n} subgraph correspondences { edge [dir=both] a -> e e -> i c -> g:s d -> l:s g -> k:s h -> m:s } }