/dt>
    <dd>list the Delaunay regions for each input site.  The first line is the
        total number of input sites.  Each remaining line starts with the number of
        Delaunay regions.  Negative indices (e.g., <em>-1</em>) indicate regions
        outside of the Delaunay triangulation.
        For the circle-in-square example, each point on the circle belongs to four
        Delaunay regions.  Use '<a href="qh-optq.html#Qc">Qc</a> FN'
        to include coincident input sites and deleted vertices. <