\begin{table}%t1
  %\centering
\par
    \caption{Ionization equilibria between \ion{Fe}{i} and \ion{Fe}{ii}, and 
between \ion{Co}{i} and \ion{Co}{ii}.
Each abundance was given for two model atmospheres.
\label{tab1}}
        \begin{tabular}{ccc}
     \hline \hline 
      \noalign{\smallskip}
& (10~300,~3.81) & (11~000,~4.00) \\
\hline 
\par
 \ion{Fe}{i} & 8.32 $\pm$~0.17 & 8.64 $\pm$~0.18  \\
\ion{Fe}{ii} &8.29 $\pm$~0.32  & 8.43 $\pm$~0.28  \\
\hline 
\ion{Co}{i} & 8.43 $\pm$~0.08  & 8.72 $\pm$~0.10 \\
 \ion{Co}{ii} & 8.35 $\pm$~0.37   & 8.38 $\pm$~0.34  \\
  \hline
\end{tabular}
  \end{table}