\begin{table}%t3
\caption{\label{interferometry}Interferometric observations of A-B pair.}
%\centering
\par
\begin{tabular}{c c c c} 
 \hline\hline \noalign{\smallskip}
 Date & $\theta$ & $\rho$   & References \\
      &  [deg]   & [arcsec] &  \\
 \hline
 1980.1566 &   0.9 & 0.145 & \mbox{McAlister} et~al. (\cite{1983ApJS...51..309M}) \\
 1980.4817 &   2.0 & 0.142 & \mbox{McAlister} et~al. (\cite{1983ApJS...51..309M}) \\
 1983.0510 &  10.0 & 0.117 & \mbox{McAlister} et~al. (\cite{1987AJ.....93..688M}) \\
 1983.0701 &  12.2 & 0.106 & \mbox{McAlister} et~al. (\cite{1987AJ.....93..688M}) \\
 1984.0558 &  22.6 & 0.059 & Hartkopf et~al. (\cite{1996AJ....111..370H}) \\
 1986.4067 & 327.7 & 0.058 & \mbox{McAlister} et~al. (\cite{1989AJ.....97..510M}) \\
 1987.1194 & 345.5 & 0.076 & Fu et~al. (\cite{1997AJ....114.1623F}) \\
 1987.2642 & 340.2 & 0.083 & \mbox{McAlister} et~al. (\cite{1989AJ.....97..510M}) \\
 1987.2859 & 343.0 & 0.089 & Fu et~al. (\cite{1997AJ....114.1623F}) \\
 1987.2886 & 348.8 & 0.089 & Fu et~al. (\cite{1997AJ....114.1623F}) \\
 1987.2914 & 346.8 & 0.089 & Fu et~al. (\cite{1997AJ....114.1623F}) \\
 1988.1022 & 345.5 & 0.097 & Fu et~al. (\cite{1997AJ....114.1623F}) \\
 1989.2300 & 353.6 & 0.117 & \mbox{McAlister} et~al. (\cite{1990AJ.....99..965M}) \\
 1990.2081 & 357.9 & 0.132 & Balega et~al. (\cite{1994AetAS..105..503B}) \\
 1990.2621 & 356.0 & 0.136 & Hartkopf et~al. (\cite{1992AJ....104..810H}) \\
 1990.2759 & 356.0 & 0.135 & Hartkopf et~al. (\cite{1992AJ....104..810H}) \\
 1991.25   & 357.0 & 0.136 & Perryman \& ESA (\cite{HIP}) \\
 1991.3187 &   0.7 & 0.140 & Hartkopf et~al. (\cite{1994AJ....108.2299H}) \\
 1992.3098 &   4.3 & 0.138 & Hartkopf et~al. (\cite{1994AJ....108.2299H}) \\
 1992.3127 &   4.2 & 0.139 & Hartkopf et~al. (\cite{1994AJ....108.2299H}) \\
 1993.1971 &   7.7 & 0.128 & Hartkopf et~al. (\cite{1994AJ....108.2299H}) \\
 2002.3224 & 359.8 & 0.140 & Horch et~al. (\cite{2008AJ....136..312H}) \\
 2002.3224 &   0.0 & 0.140 & Horch et~al. (\cite{2008AJ....136..312H}) \\
 2002.3224 &   0.0 & 0.139 & Horch et~al. (\cite{2008AJ....136..312H}) \\
 2006.1917 &  17.8 & 0.077 & Mason et~al. (\cite{2009AJ....137.3358M}) \\
 \hline
\end{tabular}
\end{table}