\begin{table}%t3
%\centering
\par
\caption{Parameters of the ashes for $\rho=\unit[5.0 \times 10^7]{g\ cm^{-3}}$.\label{tab:par2}}
\begin{tabular}{l*{3}{c}}
\hline\hline
                                                                        & N                     & S             & M2    \\
\hline\\[-3mm]
$T$/10$^9$ K                                            &5.505          &5.265  &5.336  \\      
%\hline
$\rho$/10$^7$ g cm$^{-3}$                       &1.919          &2.205  &2.116  \\
%\hline
$\Delta q$/10$^{17}$ erg g$^{-1}$       &7.860          &5.977  &6.268  \\
\hline 
\end{tabular}
\end{table}