\begin{table}%t2
\caption{\label{table:ecf}HRC energy conversion factors (ecf's) and unabsorbed HRC and PN luminosities for different blackbody temperatures.}
%\centerline
 {\small \begin{tabular}{cccc}
\hline \hline\noalign{\smallskip}
$kT$ & ecf$_{\rm HRC}$ & $L_{0.2{-}1.0}^{\rm HRC}$$^a$ & $L_{0.2{-}1.0}^{\rm PN}$$^b$\\ \noalign{\smallskip}
{} [eV] & $\big[$\power{10} ct cm$^2$~erg$^{-1}\big]$ & $\big[$\power{37} erg~s$^{-1}$$\big]$ & $\big[$\power{35}~erg~s$^{-1}$$\big]$\\
 \noalign{\smallskip}\hline\noalign{\smallskip}
40 & 1.16 & $10.9 \pm 0.7$ & 3.6\\
50 & 1.57 & $8.1 \pm 0.5$ & 2.7\\
60 & 2.09 & $6.1 \pm 0.4$ & 2.3\\
70 & 2.71 & $4.7 \pm 0.3$ & 2.1\\
\hline
\end{tabular}}
\medskip
Notes: $^a$~for ObsID~8527 (see Table~\ref{table:xray}); $^b$~for ObsID 0511380201 (see Table~\ref{table:xray}).
\end{table}