\begin{table}%t7
%\centering
\par
\caption{1D~gravity effects on the Fe and O abundances.}
\small%\centering
\par
\begin{tabular}{lrrr}     
\hline
\hline       
\noalign{\smallskip}
Species & $\Delta{\log g}$ & $\Delta{[{\rm X}/{\rm H}]_{\rm A}}$ & $\Delta{[{\rm X}/{\rm H}]_{\rm B}}$  \\
\noalign{\smallskip}
\hline
OH    & 0.3 & --0.12  & --0.08 \\ 
\ion{Fe}{i}~  & 0.3 & --0.01  & --0.02 \\ 
\ion{Fe}{ii}~ & 0.3 & 0.09  & 0.11 \\ 
\hline
\end{tabular}
\label{tbl4}  
\end{table}