\begin{table}%t2
\caption{Coefficients and parameters describing the distribution function, 
Pearson~I curve of our sample.}
\label{biva}
%\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
All         & 82.8  & 12.9  & 0.43  & 83.3 & 2.72  & --0.60 & --0.69 & 0.24   & 0.52 & 0.52 & 0.77 \\
$\sigma_{\rm p}$   & 16.5  & 1.56  & 0.04  & 10.2 & 0.39  &  0.04 &  &   &  &  &  \\
\hline
\end{tabular}
\end{table}