\begin{table}%t7
%\centering
\par
 {\footnotesize %\centering
 \caption{\label{tab:EMSS_LX_class}The three X-ray luminosity classes of the EMSS cluster sample. See text for more details. }
\begin{tabular}{l l  c  }
\hline\hline
 $L_{\rm X}$ [$0.5{-}2$~keV] & & \# \\ % & \# of  & \# of arcs\\
 EMSS sample class & & clusters  \\ % & arcs & per cluster\\
\hline
 \tt I \rm   & [$\log(L_{\rm X})\leq44.32$]    & 11 \\
 \tt II \rm  & [$44.32< \log(L_{\rm X})<44.47$] & 10 \\
 \tt III \rm & [$44.47\leq\log(L_{\rm X})$]    & 12 \\
\hline
\end{tabular} }
\end{table}