\begin{table}%t1
\caption{Initial and final stellar mass (in solar units), and the final 
surface chemical abundances by mass (PG~1159~regime) for the evolutionary 
sequences considered in this work.}\label{table2}
%\centering
\small
\begin{tabular}{llccccc}
\hline
\hline
 & & & & & & \\[-8pt]
$M_{\rm ZAMS}$ & $M_{\rm PG}$ & $^4$He & $^{12}$C & $^{13}$C & $^{14}$N & $^{16}$O \\
\hline
 1    & 0.530 &  0.33  &  0.39 & 0.051  & 0.019  & 0.17  \\
 1    & 0.542 &  0.28  &  0.41 & 0.051  & 0.018  & 0.21  \\
 2.2  & 0.565 &  0.39  &  0.27 & 0.048  & 0.027  & 0.22  \\
 2.7  & 0.589 &  0.31  &  0.38 & 0.040  & 0.012  & 0.23  \\
 3.05 & 0.609 &  0.50  &  0.35 & 0.003  & 0.002  & 0.10  \\
 3.5  & 0.664 &  0.47  &  0.33 & 0.019  & 0.013  & 0.13  \\
 3.75 & 0.741 &  0.48  &  0.34 & 0.0007 & 0.0002 & 0.14  \\
\hline
\end{tabular}
\end{table}