\begin{table}%t1
      \caption{Identification with sources in Linden-V\o rnle et~al.}\label{tab1}
%\centerline
$${
          \begin{tabular}{lrllr@{$\;\pm\;$}l}
            \hline
            \hline
 \multicolumn{2}{c}{Linden-V\o rnle et~al.} & & 
  \multicolumn{3}{c}{This work} \\
Name & $Flux$(mJy)$^a$ & & Name & \multicolumn{2}{c}{$Flux$(mJy)} \\
\cline{1-2} \cline{4-6}
 E1\_1  & 321  $\pm$ 27 & & 1EX041     & 321  & 55  \\
 E1\_2  & 269  $\pm$ 27 & & Note$^b$   & 174  & 77 \\
 E4\_1  & 1218 $\pm$ 27 & & 1EX023     & 1218 & 45 \\
 E4\_2  & 289  $\pm$ 19 & & 1EX062     & 400  & 67 \\
 E4\_3  & 331  $\pm$ 28 & & 1EX028/269 & 419  & 55 \\
 NW1\_1 & 540  $\pm$ 27 & & Note$^b$   & 555  & 320 \\
 NW1\_2 & 331  $\pm$ 28 & & 1NW181     & 279  & 49 \\
 NW2\_1 & 432  $\pm$ 27 & & 1NW023/092 & 434  & 57 \\
            \hline          
          \end{tabular}}$$
\medskip
$^{a}$ The flux values by Linden-V\o rnle et~al. are multiplied 
      by a factor of~1.63 so
      that the C\_90 flux of Lockman E4\_1 (UGC{\ts}06009) is equal to the 
      IRAS  value. \\
$^{b}$ These sources are detected by DAOPHOT, but with $SNR{\rm s} < 3$.
   \end{table}