\begin{table}%t2
%\centering
\par
\caption{\label{miepm}Median of the internal errors of the proper motions.}
\begin{tabular}{lccc}
\hline\hline\noalign{\smallskip}
& Calculated & $\epsilon_{ \mu(\alpha \cos{\delta})}$ & $\epsilon_{\mu(\delta)}$\\
 & proper motions & [mas/yr] & [mas/yr]\\
\hline
  All stars &  8774& 2.1 &1.8 \\
  Two epochs & 852 & 2.9 & 3.2 \\
  Three epochs & 7922 & 2.0 & 1.6 \\
\hline
\end{tabular}
\end{table}