options control the output of Delaunay triangulations:</p>
<blockquote>

<dl compact>
    <dd><b>Delaunay regions</b></dd>
    <dt><a href="qh-opto.html#i">i</a></dt>
    <dd>list input sites for each Delaunay region. The first line is the number of regions.  The
        remaining lines list the input sites for each region.  The regions are
                oriented.  In 3-d and
        higher, report cospherical sites by adding extra points.  Use triangulated
        output ('<a href="qh-optq.html#Qt">Qt</a