\begin{table}%T3
\caption{\label{Tab3}Astrometry on background star cc2 with VLT/NACO.}
\small%\centering
\par
\begin{tabular}{l|cc|cc}
 \hline \hline
Epoch   & \multicolumn{2}{c}{Separation between GQ~Lupi~A and cc2} & \multicolumn{2}{c}{Separation between GQ~Lupi~b and cc2} \\ 
year    & $\Delta$RA [$''$] & $\Delta $Dec [$''$] & $\Delta $RA [$''$] & $\Delta $Dec $[$$''$] \\
 \hline
2004.48 & $4.3265 \pm 0.0164$ & $4.6473 \pm 0.0175$ & $3.5953 \pm 0.0137$ & $4.5775 \pm 0.0173$ \\
2005.40 & $4.3120 \pm 0.0164$ & $4.6739 \pm 0.0177$ & $3.5812 \pm 0.0136$ & $4.5969 \pm 0.0174$ \\
2005.60 & $4.2977 \pm 0.0163$ & $4.6715 \pm 0.0177$ & $3.5703 \pm 0.0135$ & $4.5956 \pm 0.0174$ \\
2006.14 & $4.3041 \pm 0.0163$ & $4.6909 \pm 0.0178$ & $3.5786 \pm 0.0136$ & $4.6134 \pm 0.0175$ \\
 2006.54 & $4.2888 \pm 0.0163$ & $4.6965 \pm 0.0179$ & $3.5590 \pm 0.0136$ & $4.6272 \pm 0.0179$ \\ \hline
 \end{tabular}
\end{table}