\begin{table}%t2
%\centering
\par
\caption{\label{tab_param}Derived stellar properties of the ionizing stars of RCW~79, RCW~82 and RCW~120. }
\begin{tabular}{llcccccc}
\hline\hline
\noalign{\smallskip}
Source          & ST & \teff\ & \lL\ & $M_{\rm evol}$ & log($Q_{0}$) & log($L_{0}$) \\
                &    & [kK]    &     & [\msun]   & &  \\
\hline                                                              
RCW79 2    & O7.5--8V/III &  36~$\pm$~2 & 4.95~$\pm$~0.22 & $26.2^{\rm +6.1}_{-4.8}$   & 48.45~$\pm$~0.23 & 37.90~$\pm$~0.23 \\
RCW79 4a   & O4--6V/III   &  40~$\pm$~2 & 5.56~$\pm$~0.22 & $46.1^{\rm +13.3}_{-12.7}$ & 49.25~$\pm$~0.23 & 38.74~$\pm$~0.23 \\
RCW79 5a   & O4--6V/III   &  40~$\pm$~2 & 5.56~$\pm$~0.22 & $46.1^{\rm +13.3}_{-12.7}$ & 49.25~$\pm$~0.23 & 38.74~$\pm$~0.23 \\
RCW79 6a   & O6--8V/III   &  38~$\pm$~2 & 5.33~$\pm$~0.22 & $36.2^{\rm +7.2}_{-6.2}$   & 48.91~$\pm$~0.23 & 38.40~$\pm$~0.23 \\
RCW79 6b   & O9--B2V      &  28~$\pm$~4 & 4.15~$\pm$~0.27 & $13.2^{\rm +3.5}_{-3.8}$   & 47.00~$\pm$~0.31 & 36.42~$\pm$~0.31 \\
RCW79 7    & O6--8V/III   &  37~$\pm$~2 & 5.30~$\pm$~0.22 & $35.1^{\rm +6.4}_{-7.3}$   & 48.80~$\pm$~0.23 & 38.28~$\pm$~0.23 \\
RCW79 8a   & O9--B2V/III  &  30~$\pm$~3 & 4.76~$\pm$~0.24 & $19.2^{\rm +5.0}_{-3.7}$   & 47.33~$\pm$~0.26 & 36.75~$\pm$~0.26 \\
RCW79 8b   & O9--B2V/III  &  30~$\pm$~3 & 4.67~$\pm$~0.24 & $18.6^{\rm +4.6}_{-4.2}$   & 46.75~$\pm$~0.26 & 36.16~$\pm$~0.26 \\
RCW79 9a   & O9--B2V/III  &  30~$\pm$~3 & 4.57~$\pm$~0.24 & $17.7^{\rm +4.3}_{-4.4}$   & 47.95~$\pm$~0.26 & 37.38~$\pm$~0.26 \\
RCW79 9b   & O9--B2V/III  &  30~$\pm$~3 & 4.53~$\pm$~0.24 & $17.3^{\rm +4.1}_{-4.5}$   & 48.52~$\pm$~0.26 & 37.99~$\pm$~0.26 \\
RCW79 10   & O6.5--8V/III &  38~$\pm$~2 & 5.26~$\pm$~0.21 & $34.5^{\rm +6.8}_{-5.9}$   & 48.96~$\pm$~0.22 & 38.45~$\pm$~0.22 \\
RCW79 12b  & O9--B2V/III  &  28~$\pm$~4 & 4.21~$\pm$~0.27 & $13.6^{\rm +3.7}_{-3.8}$   & 47.06~$\pm$~0.31 & 36.48~$\pm$~0.31 \\
 & & & & & & \\
CHII \#6  & O7.5--9.5V/III& 37.5~$\pm$~2& 5.25~$\pm$~0.22 & $34.1^{\rm +6.6}_{-6.8}$   & 48.79~$\pm$~0.23 & 38.26~$\pm$~0.23 \\
 & & & & & & & \\
RCW82 e2   & O9--B2V/III  & 34~$\pm$~2  & 4.95~$\pm$~0.27 & $24.1^{\rm +6.5}_{-5.0}$ & 48.37~$\pm$~0.28 & 37.81~$\pm$~0.28 \\
RCW82 e3   & O9--B2V/III  & 35~$\pm$~2  & 5.07~$\pm$~0.27 & $27.5^{\rm +8.5}_{-5.8}$ & 48.59~$\pm$~0.28 & 38.05~$\pm$~0.28 \\
 & & & & & & \\
RCW120 e   & O6--8V/III   & 37.5~$\pm$~2& 5.07~$\pm$~0.21 & $29.9^{\rm +5.9}_{-6.8}$ & 48.58~$\pm$~0.22 & 38.05~$\pm$~0.22 \\
\hline
\end{tabular}
\tablefoot{The columns are: target name, spectral type, effective temperature, luminosity, evolutionary mass, ionizing flux, ionizing luminosity. \\
The errors on the last two parameters only take into account the uncertainties on \teff\ and \lL.}
\end{table}