\begin{table}%t2
%\centering
\par
\caption {Offsets of the reference feature from the correlated position: $\rm \alpha(J2000) = 05^h 30^m 48$\pas033,  $\rm \delta(J2000) = 33^{\circ} 47' 54$\pas6; Col.~1 reports the observing epoch; Cols.~2 and~3 respectively the RA and Dec apparent  offsets, as derived from the phase-reference calibrated maps;  Cols.~4 and~5 the corrections for the combined action of Galactic, Sun and earth motion; Cols.~6 and~7 the corrected (RA and Dec) offsets.}\label{off}
\begin{tabular}{ccccccc}
\hline\hline
Epoch & $\Delta \alpha_1$ & $\Delta \delta_1$ & $\Delta \alpha_2$ & $\Delta \delta_2$ & $\Delta \alpha_f$ & $\Delta \delta_f$\\
& (mas) & (mas) & (mas) & (mas) & (mas) & (mas)\\
\hline
16 Oct. 03 & --83.1 (0.4)& --244.7 (0.2) & --1.2 & 1.0 & --84.3 (0.4) & --243.7 (0.2)\\
22 Nov. 03 & --83.4 (0.1)& --244.6 (0.1)& --0.9& 1.2 & --84.3 (0.1) & --243.4 (0.1)\\
1 Jan. 04 &--83.7 (0.3) & $-$245.3 (0.2) & --0.6 & 1.4 & --84.3 (0.3) & --243.9 (0.2)\\
8 Feb. 04 & --84.0 (0.3)& $-$245.5 (0.2)& --0.3 & 1.7 & --84.3 (0.3) & --243.8 (0.2)\\
\hline
\end{tabular}
\end{table}