| Description: |
the horizontal position of the summary node within a level. The nodes
which are specified with horizontal positions are ordered according to these positions within the levels. The nodes which
do not have this attribute are inserted into this ordering by the crossing reduction mechanism. Note that connected components
are handled separately, thus it is not possible to intermix such components by specifying a horizontal order. If the algorithm
for downward laid out trees is used, the horizontal order influences only the order of the child nodes at a node, but not
the order of the whole level.
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