\begin{table}%t1
%\centering
\par
\caption {Spectral-type content of the volume limited samples. 
Each sample spans a one magnitude range, and overlaps by 0.5~mag with the next one. 
$M_B$ corresponds to the central value of the magnitude in each bin.\label{tab1} }
\begin{tabular}{rrrrr}
\noalign{\smallskip}
\hline
\hline
\noalign{\smallskip}
$M_{\rm B}$ & $N_{\rm T1}$ & $N_{\rm T2}$ & $N_{\rm T3+T4}$ & $N_{\rm tot}$\\ 
\hline
\noalign{\smallskip}
$-22.0$     &  782  &  249  &   41 & 1072 \\ 
\par
$-21.5$    & 1865  &  699  &  144 & 2708 \\ 
\par
$-21.0$     & 2703  & 1395  &  421 & 4519 \\ 
\par
$-20.5$     & 2732  & 1908  &  828 & 5468 \\ 
\par
$-20.0$     & 2134  & 1860  & 1100 & 5094 \\ 
\par
$-19.5$     & 1194  & 1183  &  918 & 3295 \\ 
\par
$-19.0$     &  543  &  692  &  773 & 2008 \\ 
\par
$-18.5$     &  277  &  467  &  663 & 1407 \\ 
\par
$-18.0$     &  158  &  327  &  451 & 936 \\
\par
$-17.5$     &   77  &  189  &  276 & 542 \\
\hline
\end{tabular}
\end{table}