\begin{table}%t4
\caption{\label{pearsonvimos}Linear Pearson correlation coefficients~$r$ and 1-degree polynomial fits for the different morphological groups considered here.} 
\par
%%\centering

\par
\begin{tabular}{ccccccccccccc}
\hline \hline \noalign{\smallskip}
Group & 
\multicolumn{2}{c}{[N~\textsc{ii}]$\lambda$6584/H$\alpha$} &
\multicolumn{2}{c}{[S~\textsc{ii}]$\lambda$6717, 6731/H$\alpha$} &
\multicolumn{2}{c}{[O~\textsc{i}]$\lambda$6300/H$\alpha$}\\
& $r$ & A+Bx &  $r$ & A+Bx & $r$ & A+Bx \\
\hline
All     & 0.43 & --1.08 + 0.44 x &  0.33 & --1.44 + 0.55 x & 0.54 & --3.12 + 1.02 x\\
Class 0 & 0.54 & --1.17 + 0.54 x &  0.23 & --1.00 + 0.28 x & 0.30 & --2.95 + 0.88 x\\
Class 1 & 0.43 & --1.23 + 0.50 x &  0.33 & --1.55 + 0.60 x & 0.48 & --3.14 + 1.01 x\\
Class 2 & 0.31 & --0.79 + 0.27 x &  0.60 & --1.18 + 0.69 x & 0.61 & --3.00 + 0.97 x\\
\hline
\end{tabular}
\vspace*{2.5mm}
\end{table}