\begin{table}%T3
\caption{\label{tab:abu2}\label{tab3}Abundances [X/H] for the 
early-B stars in NGC~2244 (2nd~column) compared to the inner-disk early-B 
abundances (3rd column). Also, stellar abundances for CNO elements could be
compared to abundances derived for Orion Nebula
(4th column), and with solar abundances (5th column).   }
%\centerline
{
\begin{tabular}{ccccc}
 \hline \hline 
Element &  NGC~2244$^1$  & B dwarfs$^2$   & Orion$^3$ & Sun$^4$ \\
 \hline 
C   & 8.23~$\pm$~0.06 &  8.27~$\pm$~0.12  & 8.42~$\pm$~0.02 & 8.41~$\pm$~0.03   \\
N   & 7.53~$\pm$~0.09 &  7.62~$\pm$~0.12  & 7.65~$\pm$~0.09 & 7.80~$\pm$~0.04   \\
O   & 8.56~$\pm$~0.03 &  8.57~$\pm$~0.06  & 8.51~$\pm$~0.03 & 8.66~$\pm$0~.03  \\
Mg  & 7.45~$\pm$~0.12 &  7.48~$\pm$~0.18  &  --    &  7.54~$\pm$~0.06  \\
Si  & 7.26~$\pm$~0.02 &  7.25~$\pm$~0.23  &  --    &   7.54~$\pm$~0.05    \\
Al  & 6.17~$\pm$~0.09 &  6.13~$\pm$~0.19  &  --    &   6.47~$\pm$~0.07   \\ 
 \hline
\end{tabular}}
\smallskip
References: [1] This work and Vrancken et~al.\ (\cite{Vrancken1997}); 
[2] Daflon et~al.\ (\cite{Daflon2004a}); [3] Esteban et~al.\ (\cite{Esteban2004}, \cite{Esteban2005}); [4]
  Daflon et~al.\ (\cite{Daflon2004a}, and references therein).
\end{table}