\begin{table}%t1
\caption{\label{coordinates}Coordinates used as phase centers at VLBA.} 
%\centerline
{
\small\begin{tabular}{ccc}
\hline\hline
Source & $\alpha_{\rm J2000} $ & $\delta_{\rm J2000}$ \\
       & ($^{\rm h}$ $^{\rm m}$ $^{\rm s}$) & ($^\circ$ $\arcmin$ $\arcsec$) \\
\hline
IRAS~4A1+A2  & 03:29:10.456 & +31:13:32.05 \\
IRAS~4B      & 03:29:11.960 & +31:13:08.06 \\
IRAS~4C      & 03:29:13.530 & +31:13:58.07 \\
\hline
\end{tabular}}
\end{table}