\begin{table}%t10
%\centering
\par
\caption{\label{t:meantabU}Mean abundance ratios in all the 19 GCs
of our project.}
\begin{tabular}{rrccrccrccrccrcc}
\hline\hline
Star        & $n$ & [O/Fe] & rms & $n$ & [Na/Fe] & rms & $n$ & [Mg/Fe] & rms & $n$ & [Al/Fe] & rms  & $n$ & [Si/Fe] & rms  \\ 
            &   & (dex)  &     &   &  (dex)  &     &   & (dex)   &     &   &  (dex)  &      &	&  (dex)  &	 \\   
\hline
NGC~104 & 11 &  +0.25 &0.15 & 11 & +0.53   &0.15 & 11 &  +0.52  &0.03 & 11 &  +0.52  &0.17 & 11& +0.40 & 0.02 \\
NGC~288 & 10 &  +0.34 &0.14 & 10 & +0.29   &0.28 & 10 &  +0.45  &0.03 & 10 &  +0.40  &0.09 & 10& +0.37 & 0.03 \\
NGC 1904 &  9 &  +0.05 &0.29 & 10 & +0.42   &0.29 & 10 &  +0.28  &0.06 &  8 &  +0.64  &0.41 & 10& +0.29 & 0.03 \\
NGC 2808 & 12 &  +0.07 &0.36 & 12 & +0.20   &0.24 & 12 &  +0.20  &0.25 & 12 &  +0.40  &0.49 & 12& +0.28 & 0.05 \\
NGC 3201 & 13 &  +0.03 &0.28 & 13 & +0.16   &0.31 & 13 &  +0.34  &0.04 & 13 &  +0.14  &0.38 & 13& +0.30 & 0.05 \\
NGC 4590 & 13 &  +0.41 &0.11 & 12 & +0.33   &0.19 & 13 &  +0.35  &0.06 & 13 &  +0.74  &0.18 & 13& +0.40 & 0.05 \\
NGC 5904 & 14 &  +0.08 &0.23 & 14 & +0.25   &0.24 & 14 &  +0.41  &0.07 & 14 &  +0.27  &0.29 & 14& +0.30 & 0.05 \\
NGC 6121 & 14 &  +0.26 &0.10 & 14 & +0.40   &0.15 & 14 &  +0.55  &0.03 & 14 &  +0.60  &0.05 & 14& +0.52 & 0.06 \\
NGC 6171 &  5 &  +0.12 &0.13 &  5 & +0.49   &0.15 &  5 &  +0.51  &0.04 &  5 &  +0.39  &0.07 &  5& +0.53 & 0.08 \\
NGC 6218 & 11 &  +0.34 &0.14 & 11 & +0.30   &0.27 & 11 &  +0.52  &0.04 & 11 &  +0.20  &0.18 & 11& +0.35 & 0.06 \\
NGC 6254 & 14 &  +0.41 &0.15 & 14 & +0.17   &0.19 & 14 &  +0.49  &0.04 & 10 &  +0.41  &0.37 & 14& +0.28 & 0.05 \\
NGC 6388 &  7 &$-$0.30 &0.16 &  7 & +0.59   &0.16 &  7 &  +0.21  &0.07 &  7 &  +0.69  &0.24 &  7& +0.32 & 0.10 \\
NGC 6397 & 13 &  +0.29 &0.09 & 13 & +0.18   &0.19 & 13 &  +0.46  &0.04 &    &         &     & 13& +0.34 & 0.05 \\
NGC 6441 &  5 &  +0.12 &0.20 &  5 & +0.55   &0.15 &  5 &  +0.34  &0.09 &  5 &  +0.30  &0.15 &  5& +0.33 & 0.11 \\
NGC 6752 & 14 &  +0.16 &0.28 & 14 & +0.33   &0.27 & 14 &  +0.50  &0.05 & 14 &  +0.41  &0.33 & 14& +0.38 & 0.05 \\
NGC 6809 & 14 &  +0.16 &0.11 & 14 & +0.38   &0.23 & 14 &  +0.47  &0.10 & 14 &  +0.49  &0.32 & 14& +0.38 & 0.06 \\
NGC 6838 & 12 &  +0.31 &0.13 & 12 & +0.45   &0.16 & 12 &  +0.49  &0.04 & 12 &  +0.50  &0.15 & 12& +0.38 & 0.06 \\
NGC 7078 & 13 &  +0.34 &0.19 & 13 & +0.20   &0.25 & 13 &  +0.45  &0.19 & 13 &  +0.57  &0.26 & 10& +0.43 & 0.10 \\
NGC 7099 & 10 &  +0.46 &0.20 & 10 & +0.35   &0.25 & 10 &  +0.51  &0.04 & 10 &  +0.77  &0.32 &  9& +0.34 & 0.07 \\
\hline
\end{tabular}
\end{table}