\begin{table}%t2
\caption{\label{tab:limTemp}Reverse shock temperature, $kT_{{\rm rev}}$ and limiting temperature, $kT_{{\rm rad}}$ (both in keV) for a radiative shock,  for SN~1993J at 2600~days for $\dot{M}=4.0$~$\times$ $10^{-5}~M_{\odot}~{\rm yr}^{-1}$.} 
%\centering
\small
\begin{tabular}{l|cc|cc|cc} 
\hline \hline 
 \multicolumn{1}{c|}{$\eta$}&  \multicolumn{2}{c|}{7}   &  \multicolumn{2}{c|}{12}    &  \multicolumn{2}{c}{20} \\ 
Composition  &$kT_{{\rm rad}}$& $kT_{{\rm rev}}$&$kT_{{\rm rad}}$& $kT_{{\rm rev}}$&$kT_{{\rm rad}}$& $kT_{{\rm rev}}$\\ 
\hline
Solar   & 0.51 & 4.77 & 0.63 & 1.19 & 0.68 & 0.37   \\ 
H/He (4H47)& 0.69 & 6.30 & 0.82 & 1.57 & 0.88 & 0.48 \\ 
He/N  (4H47)& 0.93 & 10.5& 1.04 & 2.60 & 1.09 & 0.81 \\ 
C/O (4H47) &  2.02 & 13.5 & 2.43 & 3.39 & 2.61 & 1.04 \\
H/He (s15s7b2f) & 0.53 & 5.01 & 0.66 & 1.25  & 0.71 & 0.39 \\ 
He/N (s15s7b2f)  & 0.86 & 10.4 & 0.99 & 2.60 & 1.04 & 0.80  \\ 
C/O (s15s7b2f)  & 2.32 & 13.9 & 2.80 & 3.46 & 3.00 & 1.07\\ 
SN~1987A-like& 0.73 & 5.70& 0.87 & 1.40  & 0.92 & 0.44 \\
\hline 
\end{tabular}
\end{table}