tes
    TO file - output results to file, may be enclosed in single quotes
    TPn  - turn on tracing when point n added to hull
     TMn - turn on tracing at merge n
     TWn - trace merge facets when width > n
    TRn  - rerun qhull n times.  Use with 'QJn'
    TVn  - stop qhull after adding point n, -n for before (see TCn)
     TCn - stop qhull after building cone for point n (see TVn)

Precision options:
    Cn   - radius of centrum (roundoff added).  Merge facets if non-convex
     An  - cosine of maxi