\begin{table}%t4
\caption{Coefficients and parameters describing the distribution functions, 
Pearson~I curves, of starburst and spiral populations.}
\label{bivasb}
%\centering
\small
\begin{tabular}{llllllllllll}
\hline
\hline
 & & & & & & & & & & & \\[-8pt]
Case        & $y_0$ & $a_1$ & $a_2$ & $m_1$ & $m_2$ & Mode  & Mean  & $\sigma$ & Skew & Kurt & $\chi_\nu^2$ \\
 & & & & & & & & & & & \\[-8pt]
\hline
Starbursts & 35.7  & 4.30  & 0.14  & 9.11 & 0.25  & --0.39 & --0.70 & 0.25   & 1.99 & 2.39 & 1.70 \\
$\sigma_{\rm p}$   & 12.3  & 1.55  & 0.02  & 3.56 & 0.18  &  0.002 &  &   &  &  &  \\
Spirals   & 43.2  & 1.47  & 0.32 & 4.43 & 0.19  & --0.64 & --0.64 & 0.23   & 0.05& --0.84 & 0.77 \\
$\sigma_{\rm p}$   &11.6  & 0.58  & 0.01  & 1.89 & 0.11  &  0.01 &  &   &  &  &  \\
\hline
\end{tabular}
\end{table}