\begin{table}%T6
%\centering
\par
\caption{\label{tab6}Measurements and residuals for HIP~106972.}
\begin{tabular}{lrrrrl}
\hline\hline
\multicolumn{1}{c}{Epoch} &
\multicolumn{1}{c}{$\theta$} &
\multicolumn{1}{c}{$\rho$} &
\multicolumn{1}{c}{$\Delta\theta$} &
\multicolumn{1}{c}{$\Delta\rho$} &
\multicolumn{1}{c}{Reference}\\
\hline
  1991.2500 &  315.0 &  248 & $-0.1$ & $-0$ & ESA (\cite{ESA1997})   \\
  1998.7742 &   30.9 &  104 &  0.1 &  2 & Paper I    \\
  1999.7414 &   75.0 &  101 &  0.2 & $-1$ & Paper I    \\
  1999.8152 &   77.9 &  105 &  0.6 & $-3$ & Paper II   \\
  2000.7700 &  108.8 &  140 &  0.5 &  0 & This paper \\
  2001.7577 &  125.8 &  190 &  0.1 & $-2$ & This paper \\
  2001.8451 &  128.4 &  189 & $-1.4$ &  3 & This paper \\
  2002.7361 &  136.1 &  223 &  0.1 & $-1 $& This paper \\
  2003.9273 &  147.0 &  224 & $-0.5$ &  0 & This paper \\
  2003.9273 &  146.0 &  224 &  0.5 &  0 & This paper \\
\hline
\end{tabular}
\end{table}