 VECTOR


</PRE>
<h4><a name="Brief_I/O">Brief_I/O</a></h4>
<PRE>
   Variable  I/O  Description
   --------  ---  --------------------------------------------------
    v1,v2     I   Input vectors.
</PRE>
<h4><a name="Detailed_Input">Detailed_Input</a></h4>
<PRE>
    v1, v2        are two 3-dimensional vectors for which the
                  relative difference is to be computed.
</PRE>
<h4><a name="Detailed_Output">Detailed_Output</a></h4>
<PRE>
    <b>vrel_c</b>        the relative difference between V1 a