</table>


<PRE>
</pre><h4><a name="Abstract">Abstract</a></h4><pre>

   CSPICE_GFRFOV determine time intervals when a specified ray intersects the
   space bounded by the field-of-view (FOV) of a specified instrument.

</pre><h4><a name="I/O">I/O</a></h4><pre>

   Given:

      Parameters-

      All parameters described here are declared in the header file
      SpiceGF.h. See that file for parameter values.

      SPICE_GF_CNVTOL

               is the convergence tolerance used for finding endpoints of
