   - extreme points (in order for 2-d)

Geomview options (2-d, 3-d, and 4-d; 2-d Voronoi)
    Ga   - all points as dots
     Gp  -  coplanar points and vertices as radii
     Gv  -  vertices as spheres
    Gi   - inner planes only
     Gn  -  no planes
     Go  -  outer planes only
    Gc   - centrums
    Gh   - hyperplane intersections
    Gr   - ridges
    GDn  - drop dimension n in 3-d and 4-d output
    Gt   - for 3-d 'd', transparent outer ridges

Print options:
    PAn  - keep n largest facets by area