\begin{table}%t3
\caption{\label{tab:Av}$A_V$ along the HH46-47 jet.}
%\centerline
 {
 \begin{tabular}[h]{cc}
 \hline     \hline 
\noalign{\smallskip}
 Knot & 
$A_V\pm \bigtriangleup A_V$\tablefootmark{a} \\
  & (mag)  \\
\hline  ]
S    &  6.6~$\pm$~0.2 \\%& 11.2$\pm$0.6   \\
Z2   &  12.5$\pm$~1.6 \\%&                \\
Z1   &  6.1~$\pm$~0.1 \\%& 8.2$\pm$0.4   	\\
\hline
\end{tabular}}
\tablefoot{\tablefoottext{a}{Visual extinction measured from the ratio \fe~1.64/1.25~\um.} }
\end{table}