\begin{table}%T2
%\centering
\par
\caption{Observed minus calculated statistics for
Proteus-Triton \mbox{(P-T)}, Triton and Proteus in arcseconds. The meaning
of the symbols is: $x=\Delta\alpha \cos \delta,
y=\Delta\delta$, $\sigma$ for the standard deviation and $N$
for the number of frames. There are 44 observations for Triton
and Proteus and 45 for Proteus-Triton because one observation for
the satellites has \mbox{$(\rm O{-}C) > 1\arcmin \arcmin$} and
$(\rm O{-}C) < 1\arcmin \arcmin$ for their difference. The statistics
for 2000 and 2001 are also given.}
\label{t2}
\begin{tabular}{ccccccr}\\\hline\hline
\par
P-T & Date & $\overline{x}$ & $\overline{y}$ & $\sigma_{x}$ &$\sigma_{y}$ & $N$ \\\hline
\par
 & 2002-08-08 & --0.062 & --0.082 & 0.178 & 0.125 & 23 \\  
 & 2002-08-10 & --0.106 & --0.018 & 0.108 & 0.097 & 22 \\
All &         & --0.083 & --0.051 & 0.148 & 0.115 & 45 \\\hline
\par
\bf & 2001-08-21 & --0.222 &  0.001 & 0.085 & 0.057 & 15 \rm \\
\bf & 2000-10-12 &  0.031 &  0.043 & 0.263 & 0.040 &  4 \rm \\\hline
\par
Triton  & Date & $\overline{\alpha}$ & $\overline{\delta}$ & $\sigma_{\alpha}$ &$\sigma_{\delta}$ & $N$ \\\hline
\par
 & 2002-08-08 & --0.024 & --0.010 & 0.019 & 0.029 & 23 \\
 & 2002-08-10 & --0.071 &  0.005 & 0.073 & 0.084 & 21 \\
All &         & --0.046 &  0.003 & 0.057 & 0.062 & 44 \\\hline
\par
\bf & 2001-08-21 &  0.138 &  0.187 & 0.251 & 0.153 & 15 \rm \\
\bf & 2000-10-12 &  0.030 & --0.010 & 0.145 & 0.027 &  4 \rm \\\hline
\par
Proteus & Date & $\overline{\alpha}$ & $\overline{\delta}$ & $\sigma_{\alpha}$ &$\sigma_{\delta}$ & $N$ \\\hline
\par
 & 2002-08-08 & --0.098 & --0.071 & 0.190 & 0.126 & 23 \\
 & 2002-08-10 & --0.173 & --0.024 & 0.134 & 0.118 & 21 \\
All &         & --0.134 &  0.032 & 0.169 & 0.127 & 44 \\\hline
\par
\bf & 2001-08-21 & --0.096 &  0.188 & 0.313 & 0.126 & 15 \rm \\
\bf & 2000-10-12 &  0.053 &  0.033 & 0.134 & 0.066 &  4 \rm \\\hline
\end{tabular}
\end{table}