                 body. The ellipsoid's radii must be available
                        in the kernel pool.


                     'DSK/UNPRIORITIZED[/SURFACES = &lt;surface list&gt;]'

                        The normal vector computation uses topographic
                        data to model the surface of the target body.
                        These data must be provided by loaded DSK
                        files.

                        The surface list specification is optional. The
                