\begin{table}%t2
\caption{Near-IR counterparts of \tr\ X-ray sources. The complete version is available in the electronic version.}\label{identif}
\small%\centerline
 {
\begin{tabular}{lllccclllll}
\hline \hline 
\multicolumn{1}{l}{$N_{x}$} &
\multicolumn{1}{l}{2MASS~J+} &
\multicolumn{1}{l}{Offset ($''$)} &
\multicolumn{1}{c}{$J$ mag}&
\multicolumn{1}{c}{$H$ mag}&
\multicolumn{1}{c}{$K_{\rm s}$ mag}&
\multicolumn{1}{l}{Ph.Q} &
\multicolumn{1}{l}{Cont.} &
\multicolumn{1}{l}{$A_{\rm v}$} & 
\multicolumn{1}{l}{Mass} & 
\multicolumn{1}{l}{Notes} \\
\hline
   1 & 10433859-5938306 & 2.33 & 14.57  $\pm$  0.03 & 13.21  $\pm$  0.04 & 12.63  $\pm$  0.03 &  AAA &  000 &  7.93 &   2.05   & \\
   2 &       $--------$ & $--$ & $-----$ & $-----$ & $-----$ & $--$ & $--$ & $--$ & $--$ & \\
   3 & 10434145-5942245 & 0.30 & 14.18  $\pm$  0.03 & 13.20  $\pm$  0.02 & 12.82  $\pm$  0.02 &  AAA &  000 &  4.59 &   2.24   & \\
   4 & 10434126-5941002 & 2.62 & 15.47  $\pm$  $--$ & 15.31  $\pm$  0.14 & 14.60  $\pm$  0.14 &  UBB &  000 &  $--$ &   $--$   & \\
   5 & 10434295-5944080 & 1.77 & 15.63  $\pm$  0.08 & 14.31  $\pm$  0.06 & 13.27  $\pm$  0.04 &  AAA &  000 & 15.27 &   1.25   & $K$-excess\\
   6 &       $--------$ & $--$ & $-----$ & $-----$ & $-----$ & $--$ & $--$ & $--$ & $--$ & \\
   7 & 10434401-5948177 & 0.76 &  8.70  $\pm$  0.02 &  8.51  $\pm$  0.04 &  8.47  $\pm$  0.02 &  AAA &  000 &  1.38 &   19.2   & O9.5V\\
   8 & 10434538-5939468 & 1.92 & 15.90  $\pm$  $--$ & 14.88  $\pm$  $--$ & 14.90  $\pm$  0.16 &  UUC &  000 &  $--$ &   $--$   & \\
   9 & 10434536-5938471 & 0.36 & 16.02  $\pm$  0.10 & 14.04  $\pm$  0.04 & 13.02  $\pm$  0.04 &  AAA &  000 & 14.90 &   1.01   & \\
  10 & 10434525-5941567 & 2.61 & 14.37  $\pm$  0.06 & 12.99  $\pm$  0.05 & 12.18  $\pm$  0.04 &  AAA &  000 & 12.05 &   2.16   & $K$-excess\\
  11 & 10434659-5949292 & 1.68 & 13.69  $\pm$  0.05 & 12.68  $\pm$  0.05 & 12.25  $\pm$  0.04 &  AEA &  c0c &  $--$ &   2.38   & \\
  12 & 10434809-5949246 & 0.50 & 13.51  $\pm$  $--$ & 13.09  $\pm$  0.07 & 12.85  $\pm$  0.05 &  UAA &  0cc &  $--$ &   $--$   & \\
  13 & 10434937-5944549 & 1.45 & 12.67  $\pm$  0.02 & 12.20  $\pm$  0.03 & 12.06  $\pm$  0.03 &  AAA &  000 &  0.82 &   4.89   & \\
  14 & 10435007-5945530 & 0.59 & 15.56  $\pm$  0.05 & 14.59  $\pm$  0.03 & 14.19  $\pm$  0.07 &  AAA &  000 &  4.31 &   1.30   & \\
  15 & 10435085-5937437 & 1.28 & 14.86  $\pm$  0.05 & 13.74  $\pm$  0.05 & 13.40  $\pm$  0.05 &  AAA &  000 &  3.76 &   1.86   & \\
  16 & 10435088-5950307 & 0.47 & 12.20  $\pm$  0.02 & 11.99  $\pm$  0.03 & 11.88  $\pm$  0.02 &  AAA &  000 &  0.28 &   6.22   & \\
  17 & 10435123-5940243 & 1.06 & 14.60  $\pm$  0.05 & 13.38  $\pm$  0.04 & 12.88  $\pm$  0.04 &  AAA &  000 &  6.57 &   2.03   & \\
  18 & 10435132-5945239 & 2.64 & 15.54  $\pm$  0.08 & 14.06  $\pm$  $--$ & 13.55  $\pm$  $--$ &  AUU &  cpp &  $--$ &   1.31   & \\
  19 & 10435191-5940353 & 0.40 & 16.49  $\pm$  0.16 & 15.15  $\pm$  0.09 & 14.63  $\pm$  0.11 &  CAA &  000 &  $--$ &   0.70   & \\
  20 & 10435186-5948017 & 2.02 & 14.49  $\pm$  0.05 & 13.46  $\pm$  0.06 & 12.95  $\pm$  0.05 &  AAA &  000 &  6.60 &   2.09   & \\
  21 & 10435223-5941574 & 0.29 & 14.83  $\pm$  0.05 & 14.46  $\pm$  0.08 & 14.35  $\pm$  0.11 &  AAA &  000 &  $--$ &   1.88   & \\
  22 & 10435230-5939222 & 1.87 & 13.03  $\pm$  0.04 & 11.90  $\pm$  0.06 & 11.20  $\pm$  0.04 &  AEE &  000 &  $--$ &   3.55   & Mass-deg.\\
  23 & 10435408-5941463 & 1.19 & 15.40  $\pm$  0.07 & 14.24  $\pm$  0.05 & 13.79  $\pm$  0.05 &  AAA &  000 &  5.47 &   1.40   & \\
  24 & 10435419-5938073 & 2.13 & 13.03  $\pm$  $--$ & 13.70  $\pm$  0.06 & 13.53  $\pm$  0.07 &  UAA &  0cc &  $--$ &   $--$   & \\
  25 & 10435501-5936242 & 0.75 & 11.64  $\pm$  0.02 & 11.48  $\pm$  0.03 & 11.37  $\pm$  0.03 &  AAA &  000 &  0.42 &   8.28   & \\
  26 & 10435505-5947505 & 0.70 & 14.18  $\pm$  0.03 & 13.81  $\pm$  0.04 & 13.70  $\pm$  0.06 &  AAA &  000 &  $--$ &   2.24   & \\
  27 & 10435545-5942531 & 0.50 & 14.93  $\pm$  0.05 & 14.11  $\pm$  0.05 & 13.84  $\pm$  0.06 &  AAA &  000 &  2.37 &   1.81   & \\
  28 & 10435557-5949226 & 0.39 & 13.44  $\pm$  0.03 & 12.65  $\pm$  0.03 & 12.24  $\pm$  0.03 &  AAA &  000 &  5.08 &   2.45   & \\
  29 & 10435606-5949351 & 1.97 & 14.53  $\pm$  0.05 & 13.83  $\pm$  0.05 & 13.60  $\pm$  0.06 &  AAA &  000 &  1.87 &   2.07   & \\
  30 & 10435684-5942364 & 0.45 & 14.70  $\pm$  0.05 & 13.57  $\pm$  0.03 & 12.88  $\pm$  0.04 &  AAA &  000 &  9.63 &   1.97   & $K$-excess\\
\hline
\end{tabular}}
\medskip
Column 3 (``Offset'') is the offset between X-ray and near-IR counterpart. Ph.Q refers to the 2MASS photometric quality flags for the $J$, $H$ and, $K_{\rm s}$~bands: ``$A$'' to ``$D$'' indicate decreasing quality of the measurements, ``$U$'' that the value is an upper limit. The next
column refers to the contamination and confusion flag: for further analysis we considered only sources unaffected by known artifacts, i.e. Cont.~= 000 (see 2MASS documentation for details). Masses are given in solar units, and the last column contains information
presented in Sect.~\ref{near-IR}. Note: the ``M{\sc ass-deg.}'' flag indicates mass degeneracy according to a Siess-based $J$mag-Mass calibration. 
\end{table}