\begin{table}%t3 \caption{\label{table xrayfit}Parameters for the two new EPIC spectra of Cyg~OB2 No.~8A.} %\centerline {\small \begin{tabular}{cccccccccc} \hline\hline\noalign{\smallskip} Instr. & Log~$N_{\rm w}$ & $kT_1$ & Norm$_1$ & $kT_2$ & Norm$_2$ & $kT_3$ & Norm$_3$ & $\chi^2_\nu$ (d.o.f.) & Obs. Flux \\ & & (keV) & (10$^{-2}$) & (keV) & (10$^{-3}$) & (keV) & (10$^{-3}$) & & (erg~cm$^{-2}$~s$^{-1}$) \\ \hline \multicolumn{9}{l}{{\it Observation 5}}\\ MOS1 & $\rm 21.79_{21.68}^{21.87}$ & $\rm 0.26_{0.23}^{0.30}$ & $\rm 3.43_{1.39}^{6.76}$ & $\rm 0.78_{0.72}^{0.87}$ & $\rm 7.81_{6.43}^{9.47}$ & $\rm 1.73_{1.60}^{1.90}$ & $\rm 6.33_{5.31}^{7.24}$ & 1.28 (230) & 5.28~$\times$~10$^{-12}$ \\ [1mm] pn & $\rm 21.86_{21.80}^{21.91}$ & $\rm 0.25_{0.23}^{0.29}$ & $\rm 6.06_{3.43}^{10.10}$ & $\rm 0.84_{0.79}^{0.89}$ & $\rm 10.96_{9.48}^{12.44}$ & $\rm 1.86_{1.71}^{2.06}$ & $\rm 4.96_{3.91}^{5.94}$ & 0.93 (436) & 5.69~$\times$~10$^{-12}$ \\[1mm] EPIC & $\rm 21.81_{21.77}^{21.86}$ & $\rm 0.27_{0.25}^{0.29}$ & $\rm 3.72_{2.48}^{5.78}$ & $\rm 0.81_{0.77}^{0.86}$ & $\rm 8.85_{7.93}^{9.90}$ & $\rm 1.77_{1.68}^{1.88}$ & $\rm 5.80_{5.09}^{6.44}$ & 1.36 (691) & 5.49~$\times$~10$^{-12}$ \\[1mm] \hline \multicolumn{9}{l}{{\it Observation 6}}\\ MOS1 & $\rm 21.80_{21.72}^{21.84}$ & $\rm 0.22_{0.20}^{0.24}$ & $\rm 8.14_{4.66}^{12.20}$ & $\rm 0.89_{0.82}^{0.99}$ & $\rm 7.02_{5.79}^{8.64}$ & $\rm 1.60_{1.51}^{1.75}$ & $\rm 7.96_{6.12}^{9.20}$ & 1.78 (329) & 6.00~$\times$~10$^{-12}$ \\ [1mm] pn & $\rm 21.73_{21.68}^{21.77}$ & $\rm 0.26_{0.24}^{0.28}$ & $\rm 3.83_{2.70}^{5.50}$ & $\rm 0.79_{0.76}^{0.82}$ & $\rm 9.70_{8.86}^{1.79}$ & $\rm 10.56_{1.67}^{1.79}$ & $\rm 7.75_{7.24}^{8.23}$ & 1.11 (843) & 6.72~$\times$~10$^{-12}$ \\[1mm] EPIC & $\rm 21.70_{21.67}^{21.72}$ & $\rm 0.26_{0.25}^{0.28}$ & $\rm 3.17_{2.53}^{3.84}$ & $\rm 0.81_{0.78}^{0.84}$ & $\rm 7.60_{7.06}^{8.14}$ & $\rm 1.68_{1.63}^{1.72}$ & $\rm 8.07_{7.66}^{8.45}$ & 1.96 (1274) & 6.39~$\times$~10$^{-12}$ \\[1mm] \hline \end{tabular}} \tablefoot{The parameters are derived from a {\tt wabs$_{\rm ISM}$*wind*(mekal$_1$+mekal$_2$+mekal$_3$)} model. Results are given for the MOS1, pn, and combined MOS1+pn (``EPIC'') instruments. The first absorption component ({\tt wabs$_{\rm ISM}$}) is frozen at the ISM value: $0.94~\times~10^{22}$~cm$^{-2}$. The second absorption column, quoted as $N_{\rm w}$ (in cm$^{-2}$), stands for the absorption by the ionized wind material. The normalization parameter (Norm) of the {\tt mekal} components is defined as $(10^{-14}/(4~\pi~D^2))\int{n_{\rm e}~n_{\rm H}~{\rm d}V}$, where $D$, $n_{\rm e}$ and $n_{\rm H}$ are respectively the distance to the source (in cm), and the electron and hydrogen number densities (in cm$^{-3}$). The indicated range in the parameter values represents the 90\% confidence interval. The last column gives the observed flux between 0.5 and 10.0~keV.}\vspace*{-2mm} \end{table}