e illumination angles using an ellipsoidal
                    representation of the target's surface. The role of
                    this representation is to provide an outward surface
                    normal.
                    ./
                    <a href="ilumin_c.html">ilumin_c</a> ( &quot;Ellipsoid&quot;, target, et,     fixref,
                               abcorr,      obsrvr, xpt,    &amp;etrgep,
                               esrfvc,      &amp;phase, &amp;solar, &amp;emissn );

          