startNode the starting node of each edge or NA_integer_ for the root
endNode the end node of each edge or the root id for the root
startNodeLab the character label for the startNode
endNodeLab the character label for endNode
startTime the time (distance from the root node) for the startNode or
NA_real_ for the root node
endTime the time (distance from the root node) for the endNode or
NA_real_ for the root node
part the part to which the edge belongs, i.e. the part of the
endNode
regime the regime to which the edge belongs, i.e. the regime of the
part of the endNode