">vrelg_c</a> may be used to find the relative difference
   for two vectors of general dimension.
</PRE>
<h4><a name="Examples">Examples</a></h4>
<PRE>
   This example code fragment computes the relative difference
   between the geometric and light time corrected state of Io
   with respect to Voyager 2 at a given UTC time.

         #include &quot;SpiceUsr.h&quot;
               .
               .
               .
         /.
         The NAIF integer code for Io is 501 and the code for
         Voyager 