> ( spoint, srfvec, pmgsmr );

                 /.
                 The selected boundary FOV pixel must be rotated into the
                 IAU_MARS reference frame.
                 ./
                 <a href="mxv_c.html">mxv_c</a> ( rotate, bounds[1], bndvec );

                 /.
                 Calculate the surface point of the boundary FOV
                 vector.
                 ./
                 <a href="surfpt_c.html">surfpt_c</a> ( pmgsmr, bndvec, radii[0], radii[1], radii[2], 
           