\begin{table}%T2
\caption{Near-IR counterparts of Cygnus~OB2 X-ray sources and near-IR stellar 
parameters: first rows. The complete version is available in the electronic 
edition of the journal.}
\label{identif}
%\centerline
 {\small
\begin{tabular}{cccclllcc}
\hline \hline
\multicolumn{1}{l}{$N_{\rm x}$} &
\multicolumn{2}{c}{X-ray -- 2MASS counterpart} &
\multicolumn{1}{l}{Off.} &
\multicolumn{4}{c}{2MASS photometry} &
\multicolumn{1}{l}{$A_{\rm v}^\ddag$} \\
\cline{2-3} \cline{5-8}
\multicolumn{1}{l}{\#} &
\multicolumn{1}{c}{CXOAC~J+} &
\multicolumn{1}{c}{2MASS~J+} &
\multicolumn{1}{l}{($''$)} &
\multicolumn{1}{l}{$J$}&
\multicolumn{1}{l}{$H$}&
\multicolumn{1}{l}{$K_{\rm s}$}&
\multicolumn{1}{l}{Ph.~qual$^\dag$} &
\multicolumn{1}{l}{(mag)} \\
\hline
   1 & 203225.09+411019.6 &       -- & -- & -- & -- & -- & -- & -- \\
   2 & 203225.55+410847.3 & 20322545+4108473 & 1.56 & 14.76 $\pm$ 0.06 & 14.23 $\pm$ 0.07 & 13.95 $\pm$ 0.07 &  AAA &  8.54 \\
   3 & 203225.97+411054.7 & 20322597+4110547 & 0.24 & 15.24 $\pm$ 0.05 & 13.65 $\pm$ 0.03 & 12.69 $\pm$ 0.03 &  AAA &  7.71 \\
   4 & 203227.51+411358.3 & 20322756+4114001 & 1.61 & 16.00 $\pm$ 0.06 & 14.46 $\pm$ 0.04 & 13.90 $\pm$ 0.06 &  AAA &  0.16 \\
   5 & 203227.62+410831.4 & 20322754+4108336 & 2.41 & 15.91 $\pm$ 0.06 & 14.39 $\pm$ 0.03 & 13.82 $\pm$ 0.05 &  AAA &   N/A \\
   6 & 203227.70+411317.0 & 20322768+4113169 & 0.58 & 14.96 $\pm$ 0.03 & 13.49 $\pm$ 0.02 & 12.88 $\pm$ 0.03 &  AAA &  2.21 \\
   7 & 203228.88+410807.5 &       -- & -- & -- & -- & -- & -- & -- \\
   8 & 203229.12+411400.7 & 20322913+4114012 & 0.26 & 16.74 $\pm$ 0.16 & 15.36 $\pm$ 0.08 & 14.72 $\pm$ 0.11 &  CAB &  9.01 \\
   9 & 203229.26+410850.1 & 20322928+4108494 & 1.03 & 12.26 $\pm$ 0.01 & 11.49 $\pm$ 0.01 & 11.07 $\pm$ 0.01 &  AAA &  8.52 \\
  10 & 203229.84+411454.2 & 20322985+4114536 & 0.83 & 17.44          & 15.43 $\pm$ 0.10 & 14.37 $\pm$ 0.09 &  UAA &   N/A \\
  11 & 203229.91+411056.0 & 20322994+4110575 & 1.29 & 15.26 $\pm$ 0.05 & 14.04 $\pm$ 0.04 & 13.53 $\pm$ 0.04 &  AAA &   N/A \\
  12 & 203230.63+410829.1 & 20323051+4108284 & 2.19 & 15.47 $\pm$ 0.07 & 13.71          & 13.09          &  AUU &  4.19 \\
  13 & 203230.63+410854.8 & 20323064+4108565 & 1.49 & 15.31 $\pm$ 0.05 & 13.68 $\pm$ 0.03 & 13.01 $\pm$ 0.03 &  AAA &  5.43 \\
  14 & 203230.88+411029.5 &       -- & -- & -- & -- & -- & -- & -- \\
  15 & 203231.39+410955.9 & 20323143+4109558 & 0.58 & 14.52 $\pm$ 0.05 & 13.04 & 12.46 &  AUU &  9.69 \\
\hline
\end{tabular}}
\medskip
\par
\dag\ 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. See 2MASS documentation for details.  \ddag N/A indicates stars
with unconstrained \Av~ (see text). 
\end{table}