\begin{table}%t2
%\centering
\par
\caption{Average $M_*/L_R$ ratios as a function of redshift and
spectral type, computed in the mass complete-sample, as defined by
the thick solid curve of Fig.~\ref{mass_z}. {\it All} refers to all
galaxies in the K20 sample, including also those with photometric redshift
only.  {\it Early} refer to early and early+emission
spectroscopic types and {\it late} to late spectroscopic types, as
defined in Sect.~2. Only objects with spectroscopic redshift are
included in the last two columns. \ml~ ratio in the~$V$ and $K$~bands are available
in electronic form at the web site {\tt http://www.arcetri.astro.it/$^{\sim}$k20}\label{mltab}}
     $$ 
         \begin{array}{l|ccccccccc}
            \hline\hline
~  & \multicolumn{9}{c}{\rm Maximal~age} \\
\par
            \hline
\par
{\rm Redshift}  &  \multicolumn{3}{c} {\rm All} &  \multicolumn{3}{c} {\rm Early} &  \multicolumn{3}{c} {\rm Late} \\
\par
~ & \it n & \frac{M}{L_R} & \sigma & \it n & \frac{M}{L_R} & \sigma & \it n & \frac{M}{L_R} & \sigma \\
z < 0.2              & \it     9 &  2.83 &  0.82 & \it   3 &  3.13 &  0.98 & \it   6 &  2.67 &  0.78 \\
0.2 \leq z \leq 0.7  & \it   148 &  3.02 &  1.30 & \it  69 &  3.46 &  0.90 & \it  76 &  2.49 &  1.22 \\
0.7 \leq z \leq 1.0  & \it    89 &  2.93 &  0.91 & \it  45 &  3.31 &  0.73 & \it  44 &  2.54 &  0.93 \\
1.0 < z \leq 1.5     & \it    71 &  2.65 &  0.75 & \it  18 &  3.19 &  0.38 & \it  43 &  2.34 &  0.76 \\
 1.5 < z \leq 2.0    & \it    19 &  2.39 &  0.66 & \it   5 &  2.74 &  0.69 & \it   3 &  1.73 &  0.45 \\
            \hline
\par
~ & \multicolumn{9}{c}{\rm Best Fit} \\
\par
            \hline
\par
{\rm Redshift}  &  \multicolumn{3}{c} {\rm All} &  \multicolumn{3}{c} {\rm Early} &  \multicolumn{3}{c} {\rm Late} \\
\par
~ & \it n & \frac{M}{L_R} & \sigma & \it n & \frac{M}{L_R} & \sigma & \it n & \frac{M}{L_R} & \sigma \\
z < 0.2              & \it    10 &  1.77 &  0.94 & \it   3 &  2.95 &  0.22 & \it   7 &  1.27 &  0.56 \\
0.2 \leq z \leq 0.7  & \it   104 &  1.92 &  0.83 & \it  61 &  2.18 &  0.66 & \it  42 &  1.48 &  0.82 \\
0.7 \leq z \leq 1.0  & \it    65 &  1.73 &  0.49 & \it  47 &  1.86 &  0.45 & \it  18 &  1.40 &  0.45 \\
1.0 < z \leq 1.5     & \it    38 &  1.78 &  0.54 & \it  16 &  1.61 &  0.45 & \it  16 &  1.81 &  0.62 \\
 1.5 < z \leq 2.0    & \it    15 &  1.53 &  0.53 & \it   5 &  1.35 &  0.30 & \it   2 &  1.26 &  0.43 \\
            \hline
          \end{array}
     $$ 
%
   \end{table}