ntains one region for the square.

<p>Use option '<a href="qh-optq.html#Qz">Qz</a>' if the input is circular, cospherical, or
nearly so.  It improves precision by adding a point "at infinity," above the corresponding paraboloid.

<p>If you use '<a href="qh-optq.html#Qt">Qt</a>' (triangulated output),
all Delaunay regions will be simplicial (e.g., triangles in 2-d).
Some regions may be
degenerate and have zero area.  Triangulated output identifies coincident
points.

<p>If you use '<a href="qh-optq.html#QJn"