\begin{table}%t4
 %\centering
\par
 \caption{\label{t9}The number of spectra and the tuning scheme used 
for the various SVM tests.}
\small
 \begin{tabular}{l c c c c}          
 \hline\hline                        
  Test performed & Total number & Number of spectra & Number of spectra & Scheme used for the \\
 & of spectra & in the training set & in the test set & tuning of SVMs \\
 \hline
\textit{Galaxies without reddening at zero redshift} & & & & \\
Classification of galaxy types & 28 885 & 4885 & 24 000 & 4-fold cross validation \\
Regression of input APs for early-type galaxy models & 2816 & 704 & 2112 & 4-fold cross validation \\
Regression of input APs for spiral galaxy models & 10 569 & 2643 & 7926 & fixed (fix = 4) \\
Regression of input APs for irregular galaxy models & 1500 & 750 & 750 & 4-fold cross validation \\
Regression of input APs for quenched star &  &  &  &  \\
forming galaxy models & 14 000 & 3500 & 10 500 & fixed (fix = 4) \\
Regression of output APs for all galaxy models & 28885 & 4885 & 24000 & fixed (fix = 4) \\
\hline
\textit{Galaxies with redshift, without reddening} & & & & \\
Classification of galaxy types & 144 425 & 14 440 & 129 985 & fixed (fix=4) \\
Regression of redshift for all galaxy models & 144 425 & 14 440 & 129 985 & fixed (fix = 4) \\
\hline
\textit{Galaxies with redshift and reddening} & & & & \\
Regression of redshift for all galaxy models & 144 425 & 14 440 & 129 985 & fixed (fix = 4) \\
Regression of reddening for all galaxy models & 144 425 & 14 440 & 129 985 & fixed (fix = 4) \\
\hline
\end{tabular}
\end{table}