ompute the <a href="qdelau_f.html">furthest-site Delaunay triangulation</a>.</dd>
     <dt><a href="qh-optq.html#Qz">Qz</a></dt>
    <dd>add a point above the paraboloid to reduce precision
        errors. Use it for nearly cocircular/cospherical input
        (e.g., 'rbox c | qdelaunay Qz'). The point is printed for
        options '<a href="qh-optf.html#Ft">Ft</a>' and '<a
        href="qh-opto.html#o">o</a>'.</dd>
    <dt><a href="qh-optq.html#QVn">QVn</a></dt>
    <dd>select facets adjacent to input sit