\begin{table}%t3
%\centering
\par
\caption{\label{ta:sum}Parallax and proper motion results.}
%\centering
 \small \begin{tabular}{l@{~}r@{~~}r@{~~}r@{~~}r}
\hline\hline\noalign {\smallskip}
Source & \multicolumn{1}{c}{$\pi$}&\multicolumn{1}{c}{$D_\pi$}
&\multicolumn{1}{c}{$\mu_\alpha^{a,b}$} & \multicolumn{1}{c}{$\mu_\delta^b$}  \\
& \multicolumn{1}{c}{(mas)} & \multicolumn{1}{c}{(kpc)}       & \multicolumn{1}{c}{(${\rm mas~yr^{-1}}$)}&  \multicolumn{1}{c}{(${\rm mas~yr^{-1}}$)}\\%& (km~s$^{-1}$)\\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
ON~1 &$0.389\pm0.045$&$2.57^{\rm +0.34}_{-0.27}$ &
$-3.24\pm0.89$\tablefootmark{c}&$-5.42\pm0.46$\tablefootmark{c} \\%$5\pm2.5$\\
\noalign{\smallskip}
L~1206 &$1.289\pm0.153$&$0.776^{\rm +0.104}_{-0.083}$ &$0.27\pm0.23$&$-1.40\pm1.95~$\\%$-12.1\pm1.2$\\
\noalign{\smallskip}
L~1287 &$1.077\pm0.039$&$0.929^{\rm +0.034}_{-0.033}$ & $-0.86\pm0.11$&$-2.29\pm0.56~$\\%$-24.8\pm2.3$ \\
\noalign{\smallskip}
NGC~281-W &$0.421\pm0.022$&$2.38^{\rm +0.13}_{-0.12}$ & $-2.69\pm0.16$ & $-1.77\pm0.11~$\\%-29.2\pm1.1&\\
\noalign{\smallskip}
S~255 &$0.628\pm0.027$&$1.59^{\rm +0.07}_{-0.06}$&$-0.14\pm0.54$&$-0.84\pm1.76~$\\%&$4.6\pm2.0$\\
\noalign{\smallskip}
\hline
\end{tabular}
\tablefoot{\tablefoottext{a}{The proper motion, $\mu_\alpha$, includes the factor $\cos(\delta)$;} \tablefoottext{b}{the errors of the proper motion take the uncertainty resulting from an apparent nonzero movement between the background sources into account;} \tablefoottext{c}{for the proper motion of ON~1, we took an average of the north and south components.}}
%\vspace*{2mm}
\end{table}