\begin{table}%T2
\caption{\label{tab:samples}NVSS and FIRST subsamples.}
%\centering
\par
\begin{tabular}{llrllr}
\hline
\hline\noalign{\smallskip}
\multicolumn{3}{c}{NVSS}&\multicolumn{3}{c}{FIRST}\\
\noalign{\smallskip}\hline\noalign{\smallskip}
$S_{\rm low}$ & Region & Sources & $S_{\rm low}$ & Region & Sources\\
\hline
3 mJy &  $+10\degr\le b\le+45\degr$, $-5\degr\le\delta\le+70\degr$ &
210~530 & 
3 mJy &$+2\degr\le\delta\le+20\degr$ and $9^{\rm h}\le\alpha\le16^{\rm h}$  & 188~885 \\ 
  &    &    & &  $+20\degr\le\delta\le+55\degr$ and
$8^{\rm h}\le\alpha\le17^{\rm h}$           &   \\
5 mJy &  $|b|\ge 10\degr$, $-10\degr\le \delta \le +78\degr$ & 507~608 & 5 mJy &\multicolumn{1}{c}{"\quad"}&124~974\\
7 mJy & $|b|\ge10\degr$, $-5\degr\le\delta\le+70\degr$  & 351~079 & 7 mJy &\multicolumn{1}{c}{"\quad"}& 94~099\\
10 mJy & $|b|\ge 10\degr$ & 433~951 & 10 mJy&\multicolumn{1}{c}{"\quad"}& 68~560\\
20 mJy &$|b|\ge 10\degr$  & 242~599 &&\\
30 mJy &$|b|\ge 10\degr$  & 165~459&&&\\
40 mJy &$|b|\ge 10\degr$  & 123~769&&&\\
50 mJy &$|b|\ge 10\degr$  & 97~753&&&\\
60 mJy &$|b|\ge 10\degr$  & 79~738&&&\\
80 mJy &$|b|\ge 10\degr$  & 56~903&&&\\
100 mJy & $|b|\ge 10\degr$ & 43~294&&&\\
200 mJy & $|b|\ge 10\degr$ & 17~015&&&\\
\hline
\end{tabular}
\end{table}