\begin{table}%t8
\caption{\label{tab:rel_abundances}Final abundances $\log$($N_{\rm elem}$/$N_{\rm tot}$) relative to the solar 
abundances from Grevesse \& Sauval (\cite{Grevesse1998}) as derived from ATLAS12 models.} 
%\centering
\par
\begin{tabular}{rrrrrrr}
\hline\hline
& \multicolumn{3}{c}{NGC~6397} &
\multicolumn{3}{c}{NGC~6752}
 \\
\noalign{\smallskip}
\multicolumn{1}{c}{Elem.} & 
\multicolumn{1}{c}{T183}& 
\multicolumn{1}{c}{T191} & 
\multicolumn{1}{c}{T193}&
\multicolumn{1}{c}{B652}&
\multicolumn{1}{c}{B2151}&
\multicolumn{1}{c}{B2206} \\
\noalign{\smallskip}
  &(11~390, 3.75) &(11~630, 3.80) &(11~370, 3.80) &(11~960, 3.95) &(11~310, 3.85) &(11~200, 3.80) \\
\noalign{\smallskip}
[M/H]    &\multicolumn{3}{c}{[$-$1.91]}  & \multicolumn{3}{c}{[$-$1.61]}\\
\hline
\noalign{\smallskip}
\ion{He}{} & [$-$0.96]    & [$-$0.65] & [$-$0.99] & [$-$1.04] & [$-$1.19] & [$-$1.19]\\
\ion{O}{i} &$\le$[$-$2.00]& [$-$1.64]&$\le$[$-$2.30] & $\le$[$-$2.29] &$\le$ [$-$2.29] & $\le$[$-$2.29]\\
\ion{Na}{i} &           &           &           & [$-$0.19] &     & $-$[0.80]\\
\ion{Mg}{ii} &[$-$1.65] & [$-$1.92] & [$-$1.54] & [$-$1.22] & [$-$1.29] & [$-$1.25]\\
\ion{Al}{i}  &          &           &           &           &  $\le$[$-$1.68] & \\
\ion{Si}{ii} &[$-$3.00] & [$-$2.27] &$\le$[$-$3.31] &$\le$[$-$3.11] &$\le$[$-$3.21 & $\le$[$-$3.51]]\\
\ion{P}{ii} &[$+$1.19]  &           & [$+$1.17] & [$+$1.72] & [$+$1.06] & [$+$1.02]\\
\ion{Ca}{ii} &[$-$0.30] & [$+$0.16] & [$-$0.54] & [$-$0.17] &[$-$0.66] & [$-$0.60] \\
\ion{Ti}{ii} &[$+$0.65] & [$+$1.64] & [$+$0.29] & [$-$0.05] &[$+$0.11] & [$+$0.11]\\
\ion{Cr}{ii} &[$-$0.69] & [$-$0.08] & [$-$0.19] & [$-$0.49] & [$-$0.53] & [$-$0.45]\\
\ion{Mn}{ii} &[$+$0.60] & [$+$1.15] & [$+$1.21] & [$+$1.00] & [$+$0.15] & [$+$0.45]\\
\ion{Fe}{i}-\ion{Fe}{ii} & [$+$0.35] & [$-$0.15] & [$+$0.25] & [$+$0.69] & [$+$0.34] & [$+$0.32]\\
\ion{Co}{ii}&           & [$+$0.90]\\
\ion{Ni}{ii}&[$-$0.35]  & [$-$0.21] & [$-$0.56] & [$-$0.51] & [$-$0.81] & [$-$0.81]\\
\ion{Y}{ii} & [$+$1.60] & [$+$1.60] & [$+$1.61] & [$+$2.28] & [$+$1.30] & [$+$1.42]\\
\ion{Zr}{ii}&           &           &           &           &           & [$+$0.39]\\
%{He} & [$-$0.96]    & [$-$0.65] & [$-$0.99] & [$-$1.04] & [$-$1.19] & [$-$1.19]\\
%\ion{O}{i} &$\le$[$-$2.00]& [$-$1.64]&$\le$[$-$2.30] & $\le$[$-$2.29] &$\le$ [$-$2.29] & $\le$[$-$2.29]\\
%\ion{Na}{i} &           &           &           & [$-$0.19] &     & $-$[0.80]\\
%\ion{Mg}{ii} &[$-$1.65] & [$-$1.92] & [$-$1.54] & [$-$1.22] & [$-$1.29] & [$-$1.25]\\
%\ion{Al}{i}  &          &           &           &           &  $\le$[$-$1.68] & \\
%\ion{Si}{ii} &[$-$3.00] & [$-$2.27] &$\le$ [$-$3.31] &$\le$ [$-$3.11] &$\le$[$-$3.21 & $\le$[$-$3.51]]\\
%\ion{P}{ii} &[$+$1.19]  &           & [$+$1.17] & [$+$1.72] & [$+$1.06] & [$+$1.02]\\
%\ion{Ca}{ii} &[$-$0.20] & [$+$0.16] & [$-$0.54] & [$-$0.17] &[$-$0.66] & [$-$0.60] \\
%\ion{Ti}{ii} &[$+$0.67] & [$+$1.64] & [$+$0.29] & [$-$0.05] &[$+$0.11] & [$+$0.11]\\
%\ion{Cr}{ii} &[$-$0.68] & [$-$0.08] & [$-$0.12] & [$-$0.49] & [$-$0.47] & [$-$0.39]\\
%\ion{Mn}{ii} &[$+$0.60] & [$+$1.30] & [$+$1.21] & [$+$1.00] & [$+$0.15] & [$+$0.45]\\
%\ion{Fe}{i}-{ii} & [$+$0.35] & [$-$0.15] & [$+$0.25] & [$+$0.69] & [$+$0.34] & [$+$0.32]\\
%\ion{Co}{ii}&           & [$+$1.00]\\
%\ion{Ni}{ii}&[$-$0.35]  & [$-$0.21] & [$-$0.46] & [$-$0.51] & [$-$0.81] & [$-$0.81]\\
%\ion{Y}{ii} & [$+$1.60] & [$+$1.60] & [$+$1.61] & [$+$2.28] & [$+$1.30] & [$+$1.42]\\
\hline
\noalign{\smallskip}
\end{tabular}
\end{table}