\begin{table}%t4
%\centering
\par
\caption{ Helium core masses and core abundances for model stars with
masses between 1.0 and 5.0 $M_\odot$.  The second column gives the
range of helium core masses (in $M_\odot$) that are obtained between
the formation of the core and core helium ignition.  The third and
fourth column give the Ne/O abundance of the core, relative to the
initial (ISM) Ne/O abundance, for the helium core (RGB) and
carbon-oxygen core (AGB) respectively.  
\label{tab:masses}}
\begin{tabular}{cccc}
 \hline
 \hline
  $M$ & $M_{\rm He-core}$ & \multicolumn{2}{c}{(Ne/O)$_{\rm c}$/(Ne/O)$_{\rm in}$} \\
    &                       &                     RGB & AGB \\
 \hline
 1.00 & 0.00--0.47 & 2.25 & 0.14 \\
 1.50 & 0.15--0.47 & 5.97 & 0.15 \\
 2.00 & 0.23--0.39 & 9.03 & 0.14 \\
 2.25 & 0.30--0.34 & 10.2 & 0.13 \\
%   & & & \\
 2.50 & 0.34--0.36 & 11.3 & 0.13 \\
 3.00 & 0.38--0.42 & 12.9 & 0.14 \\
 4.00 & 0.63--0.64 & 16.3 & 0.15 \\
 5.00 & 0.85--0.85 & 19.0 & 0.16 \\
 \hline
\end{tabular}
\end{table}