Level Justification
If the layout uses horizontal levels, the nodes
of the same level are placed approximately at the same y-coordinate. The
nodes can be justified, depending on whether the top border, or the bottom
border, or the center of all nodes of the same level should have the same
y-coordinate.
If the flow direction is to the top or to the bottom, the valid choices for the justification are:
Top
Bottom
Center
(the default) Figure 1 - Level Justification for Horizontal Levels
If the flow direction is to the left or to the right, the valid choices for the justification are:
Left
Right
Center
(the default)