\begin{table}%t11
 \caption {\label{t8}Summary of the performance of the SVM regression models for predicting the $z$.}
%\centerline
{
 \small
 \begin{tabular}{l c c c}          
 \hline\hline                        
  Astrophysical parameter                & mean(real-predicted)/mean(real) & sd(real-predicted)/mean(real) & SVs   \\
 \hline
 $z $                                    & --3.61e-5                        & 0.070                         & 2160   \\
\hline
 \end{tabular}}
\par
\medskip
{\small \textsc{note.} The sample is for zero interstellar 
extinction ($A_{\rm v}$) and five random values of redshift 
in the range 0--0.2. The second and third columns list the 
mean and rms errors respectively. The final column gives 
the number of support vectors in the SVM model.}
\end{table}