\begin{table}%t3

      \caption {Properties of the early-type stars in the optical and X-ray domains. Background- and exposure-corrected source fluxes (in 10$^{-5}$~photons~cm$^{-2}$~s$^{-1}$) are estimated for each observation from the fluxed images in a region of radius $r$ (in px) and for the 0.3--10.~keV band. The last columns give the average hardness ratios and dereddened X-ray luminosity in 10$^{32}$~erg~s$^{-1}$ and for the 0.5--10.~keV energy band (see text for details). A colon (:) indicates an uncertain value.
         \label{counts}}
     %\centering

         \begin{tabular}{lcccccccccccc}
            \hline\hline
Star &  Sp. Type & $\log(L_{\rm BOL}/L_{\odot})$ & $N_{\rm int}^{\rm H}/10^{22}$ & $r$ & Mean ph. flux& Obs 1 & Obs 2 & Obs 3 & $HR_1$ & $HR_2$ & $L_{\rm X}^{\rm unabs}$ & $\log(L_{\rm X}/L_{\rm BOL})$\\
            \hline
WR20a   &WN6ha+WN6ha& 6.28& 1.13& 4 & 11.87~$\pm$~0.17 & 10.3~$\pm$~0.4 & 11.2~$\pm$~0.3 & 13.2~$\pm$~0.3 & 0.64~$\pm$~0.03 & 0.385~$\pm$~0.012 & 51.7$^a$ & $-$6.15\\
WR20b   & WN6ha     & 5.86& 1.04& 9 & 3.77~$\pm$~0.09 &  3.69~$\pm$~0.18 & 3.72~$\pm$~0.15 &  3.88~$\pm$~0.16  & 0.61~$\pm$~0.08 & 0.656~$\pm$~0.016 & 19.0$^a$ & $-$6.16 \\
HD?90273 & O7I:      &5.80:&0.22:& 20& 0.81~$\pm$~0.06 &  1.03~$\pm$~0.11 & 0.77~$\pm$~0.09 &  0.66~$\pm$~0.10  & $-0.83\pm0.02$ & $-0.79\pm0.24$ & 2.82$^a$ & $-$6.93 \\
MSP18   & O5.5V-III & 5.89& 0.88& 3 & 6.92~$\pm$~0.14 &  7.4~$\pm$~0.4 & 6.4~$\pm$~0.2 &  7.4~$\pm$~0.2  & 0.38~$\pm$~0.05 & 0.19~$\pm$~0.02 & 35.8$^a$ & $-$5.92 \\
MSP32$^b$ & O9.5V:&4.61:&0.90:& 3 & 0.025~$\pm$~0.014 &  0.07~$\pm$~0.04 & 0.006~$\pm$~0.022 &  0.03~$\pm$~0.02  & $-0.15\pm0.50$ & $-0.92\pm1.38$ & 0.15& $-$7.02 \\
MSP44$^c$ & O9.5V:&4.44:&0.88:& 4 & 0.23~$\pm$~0.03 &  0.27~$\pm$~0.08 & 0.23~$\pm$~0.04 &  0.23~$\pm$~0.05  & 1. & 0.11~$\pm$~0.12 & 0.53& $-$6.31 \\
MSP120$^b$ & O9.5V: &4.58:&1.00:& 4 & 0.050~$\pm$~0.018 &  0.06~$\pm$~0.05 & 0.08~$\pm$~0.03 &  0.01~$\pm$~0.02  & $-0.07\pm0.47$ & $-0.47\pm0.59$ & 0.41& $-$6.54 \\
MSP151  & O7III     & 5.37& 0.95& 2 & 0.14~$\pm$~0.02 &  0.12~$\pm$~0.04 & 0.17~$\pm$~0.03 &  0.13~$\pm$~0.03  & 0.16~$\pm$~0.29 & $-0.28\pm0.16$ & 0.57 & $-$7.19 \\
MSP157  &O5.5V      & 5.37& 0.92& 1.5& 0.25~$\pm$~0.02 &  0.35~$\pm$~0.05 & 0.21~$\pm$~0.04 &  0.20~$\pm$~0.04  & 0.27~$\pm$~0.20 & $-0.10\pm0.10$ & 1.16$^a$& $-$6.89 \\
MSP165$^b$ & O7V:   &5.09:&1.08:& 4 & 0.52~$\pm$~0.04 &  0.48~$\pm$~0.06 & 0.63~$\pm$~0.09 &  0.45~$\pm$~0.08  & 0.57~$\pm$~0.16 & $-0.49\pm0.09$ & 1.98$^a$& $-$6.37 \\
MSP167 & O6III      & 5.14& 0.98& 2 & 2.05~$\pm$~0.07 &  1.80~$\pm$~0.12 & 2.25~$\pm$~0.11 &  2.00~$\pm$~0.13  & 0.57~$\pm$~0.07 & $0.00\pm0.04$ & 8.85$^a$& $-$5.77 \\
MSP168$^b$ & O8V:   &4.90:&0.89:& 2 & 0.079~$\pm$~0.017 &  0.05~$\pm$~0.03 & 0.08~$\pm$~0.02 &  0.11~$\pm$~0.02  & $-0.23\pm0.27$ & $-0.42\pm0.25$ & 0.41& $-$6.87 \\
MSP171 & O5V        & 5.58& 1.00& 4 & 0.16~$\pm$~0.03 &  0.13~$\pm$~0.03 & 0.18~$\pm$~0.04 &  0.13~$\pm$~0.09  & 0.22~$\pm$~0.27 & $-0.93\pm0.35$ & 1.09& $-$7.13 \\
MSP175 & O5.5V-III  & 5.49& 0.91& 2 & 0.41~$\pm$~0.03 &  0.34~$\pm$~0.05 & 0.41~$\pm$~0.05 &  0.45~$\pm$~0.05  & 0.34~$\pm$~0.14 & $-0.56\pm0.08$ & 1.78$^a$ & $-$6.82 \\
MSP182 & O4V-III    & 5.45& 0.93& 4 & 0.18~$\pm$~0.03 &  0.20~$\pm$~0.04 & 0.12~$\pm$~0.04 &  0.22~$\pm$~0.06  & $-0.24\pm0.16$ & $-0.76\pm0.20$ & 0.58 & $-$7.27 \\
MSP183 & O4V        & 6.07& 1.03& 2 & 0.70~$\pm$~0.04 &  0.67~$\pm$~0.07 & 0.60~$\pm$~0.06 &  0.86~$\pm$~0.09  & 0.09$\pm0.10$ & $-0.44\pm0.06$ & 4.49$^a$& $-$7.00 \\
MSP188 &O4V-III     & 5.93& 0.96& 2.5& 3.43~$\pm$~0.08 &  3.65~$\pm$~0.17 & 3.41~$\pm$~0.14 &  3.28~$\pm$~0.14  & 0.23~$\pm$~0.05 & $-0.10\pm0.03$ & 14.4$^a$& $-$6.35 \\
MSP199 & O3V        & 5.61& 0.97& 2 & 0.11~$\pm$~0.02 &  0.10~$\pm$~0.03 & 0.10~$\pm$~0.03 &  0.12~$\pm$~0.03  & 0.50~$\pm$~0.42 & $-0.56\pm0.18$ & 0.57& $-$7.44 \\
MSP203 & O6V-III    & 5.84& 0.95& 2 & 0.57~$\pm$~0.04 &  0.53~$\pm$~0.07 & 0.49~$\pm$~0.05 &  0.69~$\pm$~0.06  & 0.12~$\pm$~0.11 & $-0.35\pm0.07$ & 3.17$^a$ & $-$6.92 \\
MSP223$^c$ &O8.5V:  &4.80:&1.00:& 2 & 0.074~$\pm$~0.015 &  0.04~$\pm$~0.03 & 0.08~$\pm$~0.02 &  0.08~$\pm$~0.02  & 0.19~$\pm$~0.41 & 0.18~$\pm$~0.21 & 0.25& $-$6.98 \\
MSP263 & O6.5V      & 5.45& 1.09& 4 & 0.20~$\pm$~0.02 &  0.19~$\pm$~0.04 & 0.24~$\pm$~0.04 &  0.18~$\pm$~0.03  & 0.30~$\pm$~0.18 & $-0.47\pm0.13$ & 1.17$^a$& $-$6.96 \\
MSP441$^b$ & O8V:   &4.89:&0.90:&1.7 & 0.084~$\pm$~0.015 &  0.09~$\pm$~0.03 & 0.07~$\pm$~0.02 &  0.10~$\pm$~0.03  & 0.25~$\pm$~0.40 & $-0.07\pm0.19$ & 0.30& $-$7.00 \\
Src 1$^b$ & O6V:    &5.31:&0.98:& 5 & 0.071~$\pm$~0.015 &  0.07~$\pm$~0.03 & 0.10~$\pm$~0.03 &  0.05~$\pm$~0.02  & 0.15~$\pm$~0.32 & $-0.91\pm0.34$ & 0.43& $-$7.26 \\
Src 2$^b$ & O8.5III:&5.22:&1.08:& 6 & 0.46~$\pm$~0.03 &  0.54~$\pm$~0.07 & 0.46~$\pm$~0.05 &  0.40~$\pm$~0.05  & 0.63~$\pm$~0.13 & $-0.45\pm0.08$ & 1.95$^a$& $-$6.52 \\
Src 3$^b$ & O9.5V:  &4.61:&1.10:& 4 & 0.036~$\pm$~0.010 &  0.05~$\pm$~0.02 & 0.038~$\pm$~0.017 &  0.023~$\pm$~0.015  & $>$0.95 & $-0.40\pm0.32$ & 0.13& $-$7.08 \\
Src 4$^b$ & O9.5I:  &5.46:&0.95:& 1.5 & 0.146~$\pm$~0.018 &  0.06~$\pm$~0.03 & 0.25~$\pm$~0.04 &  0.10~$\pm$~0.03  & 1.02~$\pm$~0.21 & 0.26~$\pm$~0.12 & 0.57& $-$7.28 \\
            \hline
         \end{tabular}
         \smallskip
$^a$ From Table \ref{spec}.\\
$^b$ OB candidate.\\
$^v$ Eclipsing binary.
\end{table}