\begin{table}%t2
  \caption{\label{tab:limits}Constraints$^\dagger$ on the ratio of CR (non-thermal) to thermal energy ($E_{\rm CR}/E_{\rm th}$) 
    for the Coma cluster core region (within two radii) and assumed  
    cosmic-ray distribution models A and B (see text).}
  %\centerline
 {
  \begin{tabular}{ccccc}
  \hline\hline
    Radius & $\alpha$ & Model & $\eta = E_{\rm CR}/E_{\rm th}$ & $E_{\rm CR}$ [erg] \\
    \hline\\[-3.2mm]
       0.2$^\circ$ (0.33 Mpc)  & 2.1           & A             &     $<$0.19   &  ${<}7.4\times 10^{61}$ \\   
       0.4$^\circ$ (0.67 Mpc)  & 2.1           & A             &     $<$0.18   &  ${<}2.5\times 10^{62}$ \\   
       0.4$^\circ$ (0.67 Mpc)  & 2.1           & B             &     $<$0.25   &  ${<}3.5\times 10^{62}$ \\
       0.4$^\circ$ (0.67 Mpc)  & 2.3           & A             &     $<$0.55   &  ${<}7.7\times 10^{62}$ \\
     \hline
\end{tabular}}
\par
\medskip     
$\dagger$ The upper limit for $E>5$~TeV has been used here.
    \end{table}