\begin{table}%t2
%\centering
\par
\caption{\label{tab_corr}Offsets ($\Delta$) and scatter ($\sigma$) of the differences (raw -- column) between the methods: MA$\chi$ (this work). }
\par
\begin{tabular}{c| cccc}
\hline \hline%\noalign{\smallskip}
  & ADOP &NGS1 & ANNSR & k24\\
   & $\Delta  / \sigma$ & $\Delta / \sigma$ & $\Delta /  \sigma$ & $\Delta /  \sigma$\\
\par
[Fe/H] & & & & \\
\hline
\Max &   $-$0.32 / 0.23 &  $-$0.41 / 0.29&   $-$0.17 / 0.33 & $-$0.34 / 0.26\\
k24 &  0.04 / 0.14& $-$0.07 / 0.25&  0.17 / 0.27&\\
ANNSR&  $-$0.13 / 0.22 & $-$0.22 / 0.23 &\\
NGS1 & 0.08 / 0.17& & &\\
\hline
\\
${T_{\rm eff}}$ & & & & \\
\hline
\Max &  $-$61 / 112 & 80 / 132 &  $-$76 / 170 & $-$159 / 160\\
k24 &  98 / 101 & 244 / 166 & 88 / 195& \\
ANNSR & 1 / 114  & 147 / 173  & &\\
NGS1 &  $-$142 / 93 & & & \\
\hline
\\
$\log g$ & & & \\
\hline
\Max &0.51 / 0.39 & 0.38 / 0.43 &0.63 / 0.47 &  0.41 / 0.48\\
k24 & 0.08 / 0.35 & $-$0.02 / 0.42 & 0.26 / 0.48 & \\
ANNSR &  $-$0.14 / 0.36 &  $-$0.27 / 0.45 & & \\
NGS1 & 0.09 / 0.23 & &\\\hline
\end{tabular}
\tablefoot{ADOP \citep{lee08_1}, NGS1 \citep{lee08_1}, ANNSR\protect \citep{re_fiorentin07} and k24 \citep{ap06} for the entire sample of selected SEGUE stars.}
\end{table}