\begin{table}%T2
\caption{Calculated and observed mean intensities for optically thin lines used in the DEM
computation. The first three
columns are explicit. The fourth column shows the number of 
SUMER data files used
to compute the mean
intensity. The fifth column shows (in percent) the statistical 
standard
deviation of the mean intensity.
The sixth and seventh columns show the mean (or "observed'') and 
calculated
intensity. The eighth column
shows their ratio.
\label{tab:int_qs_dem2}}
%\centerline
{
\begin{tabular}{lllccccc}
\hline\hline
Ion & $\lambda (\AA)$ & Log~($T$) & $N$ & $\sigma$ (\%)& $I_{\rm obs}$ & 
$I_{\rm calc}$
& $I_{\rm calc}/I_{\rm obs}$ \\ \hline
S II & 996.000 & 4.2 & 4 & 30 & 1.0 & 1.0 & 0.98 \\
C II & 1036.32 & 4.3 & 19 & 13 & 49.5 & 71.5 & 1.44 \\
N II & 1085.68 & 4.4 & 6 & 5 & 55.2 & 46.7 & 0.85 \\
S III & 1012.53 & 4.7 & 2 & 28 & 0.7 & 1.0 & 1.49 \\
N III & 764.360 & 4.9 & 55 & 24 & 5.3 & 5.7 & 1.07 \\
N III & 763.340 & 4.9 & 53 & 25 & 2.8 & 2.9 & 1.05 \\
S IV & 1072.98 & 5.0 & 13 & 35 & 6.7 & 5.5 & 0.82 \\
O IV & 790.220 & 5.2 & 27 & 19 & 88.6 & 99.4 & 1.12 \\
O IV & 787.700 & 5.2 & 31 & 30 & 46.5 & 55.0 & 1.18 \\
S V & 786.480 & 5.2 & 43 & 29 & 27.5 & 16.2 & 0.59 \\
N IV & 765.150 & 5.2 & 68 & 23 & 63.3 & 45.8 & 0.72 \\
O V & 759.440 & 5.4 & 53 & 27 & 4.0 & 4.3 & 1.07 \\
O V & 760.450 & 5.4 & 65 & 24 & 17.8 & 20.0 & 1.13 \\
O V & 762.000 & 5.4 & 53 & 26 & 5.2 & 5.3 & 1.02 \\
O V & 758.680 & 5.4 & 53 & 24 & 5.3 & 5.7 & 1.07 \\
O VI & 1037.60 & 5.5 & 28 & 24 & 150.0 & 93.1 & 0.62 \\
O VI & 1031.93 & 5.5 & 28 & 18 & 337.4 & 186.8 & 0.55 \\
Ne VIII & 780.330 & 5.8 & 53 & 31 & 29.1 & 33.0 & 1.13 \\
Ne VIII & 770.410 & 5.8 & 68 & 30 & 61.4 & 65.8 & 1.07 \\
Mg VIII & 772.260 & 5.9 & 9 & 50 & 1.4 & 2.3 & 1.64 \\
S X & 776.370 & 6.1 & 52 & 33 & 0.9 & 0.8 & 0.85 \\
Si XII$^{1}$ & 499.410 & 6.3 & 1 & 30 & 51.3 & 51.1 & 1.00 \\
\hline
\end{tabular}}
\par
\medskip
$^{1}$ Intensity for Si XII line
comes from Vernazza \& Reeves (\cite{vernazza}). We assume 
$\sigma=30$\% for this
line. All intensities are in mW~m$^{-2}$~sr$^{-1}$.
\end{table}