\begin{table}%t6
\caption{\label{tab6}Optical-radio rotational parameters.}  
%\centering
\small                         
\begin{tabular}{lcccccl}        
\hline\hline                 
Source & $\varpi_{x}$ & $\varpi_{y}$ &$\varpi_{z}$&$B_{0}$\\
~& mas & mas & mas & mas \\
 \hline \\[-3mm]
$\rm JP$\tablefootmark{1} &$1.7\pm5.8$&$1.6\pm5.7$&$6.9\pm4.4$&$13.4\pm4.5$\\ 
$\rm CTIO$\tablefootmark{2} &$3.8\pm3.4$&$1.3\pm2.8$&$6.8\pm2.3$&--$14.0\pm2.3$\\
$\rm JP+CTIO$\tablefootmark{3} &--$1.0\pm3.2$&$4.1\pm2.8$&$6.8\pm3.3$&--$3.9\pm2.2$\\
\hline                                   
\end{tabular}
\tablefoot{\tablefoottext{1}{JP-Joint Projects, data from this work;}
\tablefoottext{2}{data from work  Assafin et~al. (\cite{Assa03});} 
\tablefoottext{3}{joint Project  data and data from work Assafin et~al. (\cite{Assa03}).}}\vspace{2.5mm}
\end{table}