\begin{table}%t2
\caption{The used prescriptions of the mass fractions of newly-produced elements
for neutron capture elements in massive stars ($r$-process).}
 \label{rBa}
%\centering
\small
\begin{tabular}{ccccccc}
\hline
\hline
&&&&&& \\[-8pt]
$M_{\rm star}$  & $ X_{\rm Ba}^{\rm new}$  & $ X_{\rm Eu}^{\rm new}$ & $ X_{\rm La}^{\rm new}$ & $ X_{\rm Sr}^{\rm new}$ & $ X_{\rm Y}^{\rm new}$ & $ X_{\rm Zr}^{\rm new}$\\
&&&&&& \\[-8pt]
\hline
&&&&&& \\[-8pt]
12.   & $9.00\times 10^{-7}$ &  $4.50\times 10^{-8}$ & $9.00\times 10^{-8}$ & $1.80\times 10^{-6}$& $3.60\times 10^{-7}$&$1.80 \times 10^{-6}$  \\ 
15.   & $3.00\times 10^{-8}$ &  $3.00\times 10^{-9}$ & $3.00\times 10^{-9}$ & $7.50\times 10^{-8}$& $2.10\times 10^{-8}$&$1.65 \times 10^{-7}$  \\   
30.   & $1.00\times 10^{-9}$ &  $5.00\times 10^{-10}$& $1.00\times 10^{-10}$& $3.25\times 10^{-9}$& $1.00\times 10^{-9}$&$5.00 \times 10^{-9}$  \\ 
\hline
\end{tabular}
\end{table}