\begin{table}%t6
%\centering
\par
\caption{Model parameters for a two-temperature {\tt mekal} model fitted to the RGS1 and RGS2 spectra of HD~159176, to the three EPIC spectra considered simultaneously and finally to all the {\it XMM} data taken together. The adopted model is {\tt wabs$_{\rm ISM}$*wabs$_{\rm WIND}$*(mekal + mekal)}. The column density given in the Table refers to the local (i.e.\ circumstellar) absorption. The interstellar column density is frozen at $0.17\times10^{22}$~cm$^{-2}$. The error bars represent the 1 $\sigma$ confidence interval.\label{fittable2}}
\begin{tabular}{ccccccc}
\hline
\hline
	& $N_{\rm H}$ & $kT^1$ & Norm$^1$ & $kT^2$ & Norm$^2$ & $\chi^2_\nu$ \\
	& (10$^{22}$ cm$^{-2}$) & (keV) & & (keV) & & d.o.f. \\
\hline
RGS1 & 0.32 & 0.16 & $1.66\times 10^{-2}$ & 0.62 & $3.96\times 10^{-3}$ & 1.36 \\
	& $\pm$0.11 & $\pm$0.01 & $\pm$$1.70\times 10$$^{-2}$ & $\pm$0.04 & $\pm$$1.81 \times 10$$^{-3}$ & 61 \\
\hline
RGS2 & 0.27 & 0.16 & $1.37 \times 10$$^{-2}$ & 0.59 & $2.67\times 10$$^{-3}$ & 1.45 \\
	& $\pm$0.09 & $\pm$0.01 & $\pm$$0.26\times 10$$^{-2}$ & $\pm$0.03 & $\pm$$1.05 \times 10$$^{-3}$ & 71 \\
\hline
EPIC & 0.40 & 0.21 & $2.19\times 10$$^{-2}$ & 0.97 & $1.48\times 10$$^{-3}$ & 2.41 \\
	& $\pm$0.14 & $\pm$0.02 & $\pm$$0.23\times 10$$^{-2}$ & $\pm$0.01 & $\pm$$0.05 \times10$$^{-3}$ & 726 \\
\hline
EPIC & 0.40 & 0.21 & $2.22\times 10$$^{-2}$ & 0.96 & $1.54\times 10$$^{-3}$ & 2.28 \\
+ RGS	& $\pm$0.01 & $\pm$0.02 & $\pm$$0.22 \times10$$^{-2}$ & $\pm$0.01 & $\pm$$0.05 \times10$$^{-3}$ & 862 \\
\hline
\end{tabular}
\end{table}