        
                  The vertices are expressed in the body-fixed
                  reference frame of the segment designated by `handle'
                  and `dladsc'. The center of this frame is the origin
                  of the cartesian coordinate system in which the
                  vertices are expressed. Note that the frame center
                  need not coincide with the central body of the
                  segment. Units are km.

                  If an error occurs on the call, `vrtc