\begin{table}%t6
\caption{\label{tab-lcurve}X-ray fluxes of \sn.}
\small%\centering
\par
\begin{tabular}{llcc}
\hline\hline\noalign{\smallskip}
\multicolumn{1}{l}{Age} &
\multicolumn{1}{l}{Instrument} &
\multicolumn{1}{c}{0.5--2.0 keV Flux} &
\multicolumn{1}{c}{Pile-up} \\
\multicolumn{1}{l}{[days]} &
\multicolumn{1}{l}{} &
\multicolumn{1}{c}{[\oergcm{-13}]} &
\multicolumn{1}{c}{correction} \\
 \hline 
1448  & ROSAT HRI    &  0.091~$\pm$~0.113 & -- \\
1645  & ROSAT PSPC   &  0.204~$\pm$~0.057 & -- \\
1872  & ROSAT PSPC   &  0.250~$\pm$~0.057 & -- \\
2258  & ROSAT PSPC   &  0.363~$\pm$~0.068 & -- \\
2408  & ROSAT PSPC   &  0.431~$\pm$~0.091 & -- \\
2715  & ROSAT HRI    &  0.442~$\pm$~0.147 & -- \\
3013  & ROSAT HRI    &  0.544~$\pm$~0.079 & -- \\
3350  & ROSAT HRI    &  0.69~$\pm$~0.10   & -- \\
3570  & ROSAT HRI    &  0.74~$\pm$~0.10   & -- \\
3640  & ROSAT PSPC   &  1.01~$\pm$~0.09   & -- \\
3650  & ROSAT HRI    &  0.93~$\pm$~0.11   & -- \\
3760  & ROSAT HRI    &  0.70~$\pm$~0.14   & -- \\
3950  & ROSAT HRI    &  1.11~$\pm$~0.12   & -- \\
4609  & Chandra ACIS &  1.68~$\pm$~0.06   & 1.035 \\
4711  & Chandra ACIS &  1.81~$\pm$~0.07   & 1.038 \\
4712  & XMM \mbox{EPIC-pn}  &  1.76~$\pm$~0.07   & -- \\
5038  & Chandra ACIS &  2.74~$\pm$~0.03   & 1.057 \\
5156  & XMM \mbox{EPIC-pn}  &  2.77~$\pm$~0.08   & -- \\
5176  & Chandra ACIS &  3.12~$\pm$~0.07   & 1.065 \\
5407  & Chandra ACIS &  4.15~$\pm$~0.05   & 1.087 \\
5561  & Chandra ACIS &  4.91~$\pm$~0.07   & 1.102 \\
5791  & Chandra ACIS &  6.79~$\pm$~0.07   & 1.142 \\
5918  & XMM \mbox{EPIC-pn}  &  8.10~$\pm$~0.09   & -- \\
5980  & Chandra ACIS &  8.46~$\pm$~0.09   & 1.177 \\
6158  & Chandra ACIS & 10.32~$\pm$~0.11   & 1.216 \\
6359  & Chandra ACIS & 13.05~$\pm$~0.78   & 1.136 \\
6533  & Chandra ACIS & 19.64~$\pm$~0.79   & 1.205 \\
6716  & Chandra ACIS & 24.35~$\pm$~1.22   & 1.255 \\
\hline
\end{tabular}
\end{table}