\begin{table}%t1
\caption{\label{tab1}Properties of the observational sample commonly used to test
  deep crustal heating. The temperature quoted for \object{Aql X-1} is the
  redshifted~$T_{\rm S}^\infty$. We use $T_{\rm S}=T_{\rm S}^\infty/(1-2GM/R)^{1/2}$ with the
  canonical $M/R=0.2$. For \object{Cen X-4} we quote the temperatures from both
  \cite{Rutledge:2001} and \cite{Campana:2004}.}
%\centering
\par
\begin{tabular}{lcccc}
\hline\hline\noalign{\smallskip}
Source & $kT_{\rm S}$ [eV] & $R$ & $\langle\dot{m}\rangle$ $[M_\odot~{\rm yr}^{-1}]$ & Reference\\
\hline\noalign{\smallskip}
\object{Aql X-1}         &$113^{+3}_{-4}$&13.2&$10^{-10}$&\cite{Rutledge:2002,Yakovlev:2003}\\
\object{Cen X-4}         &76 $\pm$ 7, 85 $\pm$ 3&12.9&$1.9\times 10^{-11}$&\cite{Rutledge:2001,Campana:2004,Tomsick:2004}\\
\object{4U 1608-522}     &170 $\pm$ 30&9.4 &$6.9\times 10^{-11}$&\cite{Rutledge:1999,Tomsick:2004}\\
\object{SAX J1808.4-3658}&$<$54      &--  &$5\times 10^{-12}$  &\cite{Campana:2002,Yakovlev:2004b}\\
\object{SAX J1810.8-2609}&$<$72      &--  &$1.7\times 10^{-12}$&\cite{Jonker:2004,Tomsick:2004}\\
\object{XTE J2123-058}   &$<$66      &--  &$2.9\times 10^{-12}$&\cite{Tomsick:2004}\\
\object{XTE J1709-267}   &$116 \pm 2$&--  &$1.2\times 10^{-10}$&\cite{Jonker:2003,Jonker:2004}\\
\hline
\end{tabular}
\end{table}