ites.</dd>
    <dt><a href="qh-optf.html#Fn">Fn</a></dt>
    <dd>list neighboring regions for each Delaunay region.  The first line is the
        number of regions.  Each remaining line starts with the number of
        neighboring regions.  Negative indices (e.g., <em>-1</em>) indicate regions
        outside of the Delaunay triangulation.
        For the circle-in-square example, the four regions on the square are neighbors to
        the region-at-infinity.</dd>
    <dt><a href="qh-optf.html#FN">FN</a><