\begin{table}%t1
\caption{\label{tabrms}Best rms fit of the positional deviation.}
%\centering
  \begin{tabular} {lcc}
\hline \hline\noalign{\smallskip}
 Deviation & 10$\sigma$ catalog & $6 \sigma$ catalog  \\
\hline
 & slope& slope  \\
%\hline
$\Delta\alpha$/cos($\delta$) vs $\alpha$ & +$0.4 \pm 0.2$ & +$0.3 \pm 0.2$\\
$\Delta\delta$ vs $\delta$ & --$1.6 \pm 0.5$ & --$1.6 \pm 0.5$ \\
$\Delta\delta$ vs $\alpha$ & --$0.6 \pm 0.2$ & --$0.6 \pm 0.2$ \\
$\Delta\alpha$/cos($\delta$) vs. $\delta$ & +$0.8 \pm 0.5$& +$0.3 \pm 0.5$\\ 
\hline
  &  amplitude &  amplitude \\
%\hline
$\Delta\alpha$/cos($\delta$) vs. $\alpha$ & --$25 \pm 12$&--$20 \pm 12$\\
$\Delta\delta$ vs. $\delta$ &--$83 \pm 24$&--$80 \pm 24$\\
$\Delta\delta$ vs. $\alpha$&+$45 \pm 10$& +$41 \pm 11$\\
$\Delta\alpha$/cos($\delta$) vs. $\delta$ &+$45\pm28$&+$20\pm26$\\ 
\hline
\end{tabular}
\end{table}