Table 2: 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.
$N_{\rm x}$ X-ray - 2MASS counterpart Off. 2MASS photometry $A_{\rm v}^\ddag $
# CXOAC J+ 2MASS J+ ('') J H $K_{\rm s}$ Ph. qual$^\dag $ (mag)
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
\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. \ddagN/A indicates stars with unconstrained $A_{\rm v}$  (see text).

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