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Pedigree Tree

A variation on the elbow dendrogram, though using the tree layout. A couple notes: a custom separation function is used so that the distance between sets of parents is half the distance between parents themselves; the tree layout draws the leaf nodes at the right extreme of the layout, so a large right margin is used to inset the leaf nodes; the leaf nodes also have a custom path ( is null).

In response to a Stack Overflow question.