\begin{table}%t5
\caption{\label{tab:x}Abell 2345 and Abell 1240 properties.}          
\small%\centerline
 {
\begin{tabular}{c c c c c c c}    
\hline\hline       
Source name &  RA          &   Dec       & $z$     &  Scale    & $F_{\rm X}$                   & $L_{\rm X}$ \\
            & (J2000)      & (J2000)     &       & (kpc/$''$) & $10^{-12}$ erg/s/cm$^2$ & $10^{44}$ erg/s \\
\hline
Abell 2345  &  21 27 11.00 & --12 09 33.0 & 0.1765& 2.957     &  5.3                & 4.3\\
Abell 1240  &  11 23  32.10 & 43 06 32   & 0.1590& 2.715     &  1.3               &  1.0\\
\hline
\end{tabular}}
\medskip
Column~1: source name; Cols.~2,~3: cluster X-ray centre (RA, Dec); Col.~4: cluster redshift; Col.~5: arcsec to kpc conversion scale; Col.~6: flux in the 0.1$-$2.4~keV band (Abell~2345) and in the 0.5$-$2~keV (Abell~1240); Col.~7: X-ray cluster luminosity in the 0.1$-$2.4~keV band (Abell~2345) and in the 0.5$-$2~keV (Abell~1240); data from B\"ohringer et~al. (\cite{Bohr04}) for Abell~2345 and from David et~al. (\cite{Davi99}) for  Abell~1240, corrected for the adopted cosmology.
\end{table}