\begin{table}%t2
%\centering
\par
\caption{\label{table2}The effective masses of nucleons and the chemical potential
of electrons at the density $u = 3.028$  and $u = 4.869$.}
\small \begin{tabular}{cccc}
\hline\hline\noalign{\smallskip}
\multicolumn{1}{c}{} & $~~~~~{m_{\rm n}}^*\left(fm^{-1}\right)$~~~~~&
\multicolumn{1}{c}{$~~~~~{m_{\rm p}}^*\left(fm^{-1}\right)$~~~~~} &
\multicolumn{1}{c}{$~~~~~\mu_{\rm e}\left(fm^{-1}\right)$~~~~~} \\
\hline
$u=3.028$   & ~~~1.7701~~~& ~~~1.7636~~~& ~~~1.1809~~~\\
$u=4.869$   & ~~~1.0115~~~& ~~~1.0050~~~& ~~~0.7457~~~\\
$ratio$   & ~~~1.7500~~~& ~~~1.7548~~~& ~~~1.5836~~~\\
\hline 
\end{tabular}
\vspace*{8mm}
\end{table}