\begin{table}%t4
%\centering
\par
\caption{Observed and total stellar mass density in the~K20 survey,
as a function of redshift. Reference value are given for the~BF
estimates; lower errors  take into account the Poisson noise and the
uncertainties in the mass estimates. Upper limits have been computed
with respect to the values provided by the MA~method, to provide an estimate
of the global uncertainties.\label{tabden}}
     $$ 
         \begin{array}{l|ccc}
            \hline\hline
 \multicolumn{4}{c}{\rm Stellar~mass~density~in~the~K20~survey } \\
\par
            \hline
\noalign{\smallskip}
{\rm Redshift}  & {{\rm Observed}^{{a}}} & {{\rm Total}^{{b}}} & M_* \simeq 10^{11} ~M_\odot^{{c}}   \\
            \hline
~ & {\rm log}~(M_*/M_\odot) &{\rm log}~(M_*/M_\odot) &{\rm log}~(M_*/M_\odot) \\
            \hline
\noalign{\smallskip}
0.2 \leq z < 0.7  & 8.51 ^{+0.24}_{-0.04}  & 8.51 ^{+0.26}_{-0.04}  & 8.32^{+0.28}_{-0.04}   \\
 \noalign{\smallskip}           
 \hline
\noalign{\smallskip}
0.7 \leq z < 1.0  &  8.44^{+0.20}_{-0.05} & 8.50^{0.23}_{-0.05}    & 8.29^{+0.20}_{-0.04}  \\
\noalign{\smallskip}
            \hline
\noalign{\smallskip}
1.0 \leq z < 1.5  &  8.19^{+0.13}_{-0.11} & 8.23^{+0.33}_{-0.11}  & 7.88^{+0.39}_{-0.1}  \\
\noalign{\smallskip}
            \hline
\noalign{\smallskip}
 1.5 \leq z < 2.   & 7.86^{+.24}_{-.24} & 8.16^{+0.11}_{-0.24}  & 7.93^{+0.1}_{-0.22}  \\
\noalign{\smallskip}
            \hline
\noalign{\smallskip}
 2 \leq z < 2.5^{{d}}   &  7.65^{+.24}_{-.24} & -  & -  \\
\noalign{\smallskip}
            \hline
          \end{array}
     $$ 
\begin{list}{}{}
\item[$^{{a}}$] On the complete sample.
\item[$^{{b}}$] Computed extending the Schechter fits from  $ 10^{8}~ M_\odot$ to  $ 10^{}~ M_\odot$.
\item[$^{{c}}$] Computed for objects with $5\times 10^{10}~ M_\odot \leq M_* \leq 5\times 10^{11}~ M_\odot$.
\item[$^{{d}}$] This value is actually a lower limit: see text for detail.
\end{list}
\par
   \end{table}