\begin{table}%t1
\caption{\label{TabPhi0}Values of the angular diameter $\phi_{0}$ (in~mas), under which $\sigma_{{V}_{\rm ud}} < 0.01$, at~$\lambda=\unit[2.2]~{\mu {\rm m}}$.}
%\centering
\par
\begin{tabular}{l c c c}
\hline \hline \noalign{\smallskip}
    $\sigma_{\phi}/\phi$ & $B=$ \unit[20]~{m} & $B=$ \unit[50]~{m} & $B=$ \unit[100]~{m}  \\[2pt]
  \hline
   5\% & 6.70 & 2.68 & 1.34 \\     
   10\% & 4.65 & 1.86 & 0.93 \\
   20\% & 3.26 & 1.30 & 0.65 \\
 \hline
\end{tabular}
\end{table}