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+<H2><A NAME="SECTION0004179000000000000000">SLA_VN - Normalize Vector</A>
+<A NAME="xref_SLA_VN">&#160;</A><A NAME="SLA_VN">&#160;</A>
+</H2>
+       <DL>
+<DT><STRONG>ACTION:</STRONG>
+<DD>Normalize a 3-vector, also giving the modulus (single precision).
+<DT><STRONG>CALL:</STRONG>
+<DD><TT>CALL sla_VN (V, UV, VM)</TT>
+<P>       </DL>
+<P>     <DL>
+<DT><STRONG>GIVEN:</STRONG>
+<DD>
+<BR>
+<TABLE CELLPADDING=3>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>V</EM></TD>
+<TH ALIGN="LEFT"><B>R(3)</B></TH>
+<TD ALIGN="LEFT" NOWRAP>vector</TD>
+</TR>
+</TABLE></DL>
+<P>     <DL>
+<DT><STRONG>RETURNED:</STRONG>
+<DD>
+<BR>
+<TABLE CELLPADDING=3>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>UV</EM></TD>
+<TH ALIGN="LEFT"><B>R(3)</B></TH>
+<TD ALIGN="LEFT" NOWRAP>unit vector in direction of V</TD>
+</TR>
+<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>VM</EM></TD>
+<TD ALIGN="LEFT"><B>R</B></TD>
+<TD ALIGN="LEFT" NOWRAP>modulus of V</TD>
+</TR>
+</TABLE></DL>
+<P>      <DL>
+<DT><STRONG>NOTE:</STRONG>
+<DD>If the modulus of V is zero, UV is set to zero as well.
+</DL>
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+<ADDRESS>
+<I>SLALIB --- Positional Astronomy Library<BR>Starlink User Note 67<BR>P. T. Wallace<BR>12 October 1999<BR>E-mail:ptw@star.rl.ac.uk</I>
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