**Table 2:** 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. 1. *All* refers to all galaxies in the K20 sample, including also those with photometric redshift only. *Early* refer to early and early+emission spectroscopic types and *late* to late spectroscopic types, as defined in Sect. 2. Only objects with spectroscopic redshift are included in the last two columns. M_*/L ratio in the V and K bands are available in electronic form at the web site http://www.arcetri.astro.it/~k20
$\begin{table} \par \begin{displaymath} \begin{array}{l\vert ccccccccc} \hline... ...0 & \it 2 & 1.26 & 0.43 \\ \hline \end{array} \end{displaymath} \end{table}$

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