| Description: |
the horizontal position of the 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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