\begin{table}%t3
%\centering
\par
  \small\caption{Mean absolute discrepancies (between our SR model and SSPP)
    calculated on the evaluation set of 38~731 real spectra (see also
    Fig.~\ref{SR}). Our models use PCA pre-processing for estimating 
    $\log~T_{\rm eff}$ and ${\rm [Fe/H]}$ and WRS pre-processing for
     estimating  $\log~g$; for the latter, PCA results are shown for
     comparison. Separate models were applied for low and high {\it SNR} spectra
    (the transition being at ${\it SNR}=35/1$).}\label{t_GlobalSR}
    \leavevmode
        \begin{tabular}[h]{llccc}
        \hline\hline  
        Method& {\it SNR}&$E_{\log~T_{\rm eff}}$ &$E_{\log~g}$&$E_{\rm [Fe/H]}$ \\ 
        \hline  
        PCA (25+25) &  &  0.0138 & 0.4288 & 0.2606 \\
        &low &0.0143 &0.7549&0.3023\\
        &high&0.0136 &0.3465&0.2384\\
        \hline
        WRS&& -- &  0.4459& --\\
        &low &--&0.4495&--\\
        &high&--&0.4450&--\\ 
       \hline
       \end{tabular}
\end{table}