\begin{table}%T2
\caption{\label{Tab2}Separation and PA~between GQ~Lupi~and its companion.} 
\small%\centerline
{\begin{tabular}{l|ccc|cc|cc|c} 
\hline\hline
Epoch & Separation & Separation & Sep. change  & Position Angle & Change in PA~& \multicolumn{2}{c}{Sign. against} & Sign. for \\
year  & (absolute) & (absolute) & since 2005.4 & (absolute) & since 2005.4 & \multicolumn{2}{c}{being b/g (d)} & orbital \\
      & [pixel] (a)& [mas] (a)  & [mas] (b)    & [deg] (a)  & [deg] (b)    & re PA~& re sep & motion (e) \\ \hline
2004.48 & $55.53 \pm 0.11$ & $734.7 \pm 3.1$ & (c)           & $275.48 \pm 0.25$ & (c) & 3.2$\sigma$ & 4.5$\sigma$ & -- \\
2005.40 & $55.52 \pm 0.13$ & $735.1 \pm 3.3$ & $0   \pm 0.5$ & $276.00 \pm 0.34$ & $0 \pm 0.042$ & -- & -- & -- \\
2005.60 & $55.34 \pm 0.20$ & $733.3 \pm 3.9$ & $-1.8 \pm 1.2$ & $275.87 \pm 0.37$ & $-0.13 \pm 0.14$ & 0.9$\sigma$ & 1.1$\sigma$ & 0.5$\sigma$ \\
2006.14 & $55.13 \pm 0.12$ & $729.8 \pm 3.3$ & $-5.3 \pm 1.0$ & $276.14 \pm 0.35$ & $0.14 \pm 0.05$ & 2.4$\sigma$ & 4.7$\sigma$ & 4.2$\sigma$ \\
2006.38 & $55.27 \pm 0.15$ & $731.4 \pm 3.5$ & $-3.7 \pm 1.0$ & $276.06 \pm 0.38$ & $0.06 \pm 0.12$ & 3.9$\sigma$ & 5.2$\sigma$ & 2.6$\sigma$ \\
2006.54 & $55.40 \pm 0.30$ & $733.2 \pm 5.0$ & $-1.9 \pm 2.1$ & $276.26 \pm 0.68$ & $0.26 \pm 0.58$ & 4.1$\sigma$ & 4.0$\sigma$ & 0.0$\sigma$ \\
2007.13 & $55.14 \pm 0.42$ & $730.0 \pm 6.4$ & $-5.1 \pm 4.6$ & $276.04 \pm 0.63$ & $0.04 \pm 0.50$ & 5.0$\sigma$ & 3.1$\sigma$ & 0.5$\sigma$ \\ \hline
\end{tabular}}
\smallskip
Remarks:
PA~is from north over east to south, after correcting for the detector orientation. \\
(a) Absolute errors; (b) relative errors;
(c) no relative errors available, because another astrometric calibration binary was observed;
(d) significance in Gaussian $\sigma$ against background (b/g) hypothesis for each epoch 
compared to the first new epoch (2005.4) regarding (re) PA~(Fig.~\ref{fig1}) and separation (Fig.~\ref{fig2});
the background hypothesis is that the companion is a non-moving background object, 
in which case GQ~Lupi~A would move away due to its known proper motion.
The significances compared from the three earlier observations from 1994 to 
2002 are 5.4, 7.0, and~6.9$\sigma$ for separation, respectively,
and 7.6 and~8.3$\sigma$ for PA~of 2005.4 compared to 1999 and 1994, respectively;
(e) the significance for deviation of each separation value from the 2005.4 
value is given in the last column (see Fig.~\ref{fig2}b).
It can be seen as evidence for orbital motion;
(d, e)~because the measurements are independent, we can add up the significances (properly)
and obtain altogether very high significance against the background hypothesis
and $\ge$$5 \sigma$ for having detected orbital motion.
\end{table}