\begin{table}%t2
\def\1{\phantom{1}}
\def\fnote#1{^{{#1}}}
\caption{Astrometric measurements of T~Tau N -- Sa -- Sb.}
\label{ObsNSabTab}
\small%\centerline
 $${
\begin{tabular}{lcl@{${}\pm{}$}ll@{${}\pm{}$}lcl@{${}\pm{}$}ll@{${}\pm{}$}lcl}
\hline\hline
Date (UT) 	&& \multicolumn{4}{c}{T Tau N -- Sa}		&& \multicolumn{4}{c}{T Tau Sa -- Sb} 	&& Source \\
          	&& \multicolumn{2}{c}{$d$ [mas]} & \multicolumn{2}{c}{PA~$[^\circ]$}
		&& \multicolumn{2}{c}{$d$ [mas]} & \multicolumn{2}{c}{PA~$[^\circ]$} \\
\hline
1997 Oct. 12 	&& $693  $&$12$	 	& $178.6$&$0.9$ 	&& $\1 51$  &$9  $ & $218  $&$8  $ 	&& \cite{duchene06}\\
1997 Dec. 15 	&&\multicolumn{2}{c}{--}& \multicolumn{2}{c}{--}&& $\1 53$  &$9  $ & $225  $&$8  $ 	&& \cite{koresko00}\\
2000 Feb. 20 	&& $686.3$&$2.4$	& $180.5$&$0.8$ 	&& $\1 79$  &$2  $ & $253  $&$2  $ 	&& This work / \cite{koehler00a}\\
2000 Nov. 19 	&& $702  $&$5  $	& $180.8$&$0.2\fnote{a}$&& $\1 92$  &$3  $ & $268.1$&$1.6\fnote{a}$&& \cite{duchene02}\\
2002 Oct. 30 	&& $697.6$&$2.1$	& $183.3$&$0.3$ 	&& $106.5$&$2.6$ & $284.5$&$1.4$ 	&& \cite{schaefer06}$\fnote{b}$\\
2002 Nov. 20 	&& $693  $&$4  $	& $183  $&$1  $ 	&& $\1 94.3$&$3.3$ & $278  $&$1  $ 	&& \cite{mayama06}\\
2002 Dec. 13 	&& $695  $&$7  $	& $183.3$&$0.7$ 	&& $108  $&$1  $ & $284.9$&$0.9$ 	&& \cite{duchene05}\\
2002 Dec. 15 	&& $693.5$&$1.4$	& $182.3$&$0.3$ 	&& $106.4$&$1.6$ & $283.9$&$0.4$ 	&& This work\\
2002 Dec. 20 	&&\multicolumn{2}{c}{--}& \multicolumn{2}{c}{--}&& $110  $&$4  $ & $282  $&$2.1$ 	&& \cite{beck04}\\
2002 Dec. 24 	&& $691  $&$12 $	& $181.7$&$1.1$ 	&& $108  $&$5  $ & $287.8$&$2.6$ 	&& \cite{furlan03}\\
2003 Nov. 18 	&& $700.4$&$2.9$	& $183.2$&$0.6$ 	&& $116.5$&$3.1$ & $291  $&$1.6$ 	&& \cite{schaefer06}\\
2003 Dec. 12 	&& $698  $&$5  $	& $181.9$&$1.2$ 	&& $118  $&$2  $ & $288.6$&$1.1$ 	&& \cite{duchene05}\\
2003 Dec. 12 	&& $696.2$&$2.0$	& $182.8$&$0.1$ 	&& $113.3$&$1.0$ & $288.5$&$0.8$ 	&& This work\\
2004 Nov. 23 	&& $690  $&$3  $	& $186  $&$1  $ 	&& $100  $&$2  $ & $298  $&$1  $ 	&& \cite{mayama06}\\
2004 Dec.~9 	&& $693.2$&$1.2$	& $183.5$&$0.1$ 	&& $118.9$&$1.1$ & $295.9$&$0.6$ 	&& This work\\
2004 Dec. 19 	&& $689  $&$3  $	& $183.6$&$0.4$ 	&& $116  $&$4  $ & $294.1$&$1.4$ 	&& \cite{duchene06}\\
2004 Dec. 24 	&& $698.5$&$2.2$	& $184.7$&$0.3$ 	&& $119.6$&$2.8$ & $297.2$&$1.4$ 	&& \cite{schaefer06}\\
2005 Feb.~9 	&& $704.0$&$1.6$	& $184.4$&$0.1$ 	&& $120.7$&$1.9$ & $300.4$&$0.9$ 	&& \cite{schaefer06}\\
2005 Mar.~9 	&& $702.8$&$2.4$	& $184.4$&$0.2$ 	&& $120.3$&$2.9$ & $300.6$&$1.4$ 	&& \cite{schaefer06}\\
2005 Mar. 24 	&& $703.7$&$0.9$	& $184.3$&$0.1$ 	&& $121.5$&$1.2$ & $300.4$&$0.6$ 	&& \cite{schaefer06}\\
2005 Oct. 20 	&& $703.3$&$1.2$	& $184.9$&$0.1\fnote{c}$&& $123.7$&$1.3$ & $303.3$&$0.6$ 	&& \cite{schaefer06}\\
2005 Nov. 13 	&& $694  $&$2$		& $184.4$&$0.2$ 	&& $119  $&$1  $ & $300.6$&$1.0$ 	&& \cite{duchene06}\\
2005 Dec. ~6 	&& $703.0$&$5.7$	& $185.8$&$0.5$ 	&& $121.9$&$6.8$ & $304.8$&$3.2$ 	&& \cite{schaefer06}\\
2006 Oct. 11 	&& $694.4$&$0.9$	& $184.9$&$1.0$ 	&& $125.1$&$0.7$ & $304.7$&$1.0$ 	&& This work\\
2007 Sep. 16	&& $693.6$&$1.8$	& $185.0$&$0.2$		&& $127.0$&$0.5$ & $308.2$&$0.3$	&& This work\\
\hline
\end{tabular}}$$
\medskip
$^{a}$ Corrected value according to \cite{duchene06}. \\
$^{b}$ This is a re-analysis of the data presented in \cite{beck04} using a more sophisticated PSF fitting routine. \\
$^{c}$ $90^\circ$ subtracted from the position angle in \cite{schaefer06} to correct for the orientation of the camera (Schaefer, priv. comm.).
\end{table}