                   srfpts(1,i)
                     srfpts(2,i)
                     srfpts(3,i)

                  are the Cartesian coordinates, expressed in the
                  reference frame designated by `fixref', of the ith
                  surface point in the array. Each surface point
                  represents an offset from the center of that frame.

                  All surface points must actually be &quot;on&quot; the surface,
                  that is, the distance of each point from th