\begin{table}%t1
%\centering
\par
\caption{\label{hparstab}Parameters of the scale length vs. luminosity relation (Eq.~(\ref{heq})).}
\begin{tabular}{lcc}
\hline
\hline
Morphological type & $a$ & $b$ \\
\hline
Sa & 0.35 & 0.70 \\
Sb & 0.39 & 0.58 \\
Sc & 0.42 & 0.39 \\
Sd & 0.46 & 0.23 \\
\hline
\end{tabular}
\end{table}