\begin{table}%t5
%\centering
\par
\caption{\label{ncbfit}Fit parameters of the function $N_{\rm c}(z) = N_{\rm c}(0)(1+z)^m$ to the data.}
\begin{tabular}{lcc}
\hline\hline \noalign{\smallskip}
Sample selection & $N_{\rm c}(0)$  & $m$\\
\hline
$-22 < M_B \leq -20$     &  $0.008 \pm 0.001$ & $2.5 \pm 0.1$ \\
$-22 < M_B \leq -19.5$   &  $0.014 \pm 0.002$ & $2.2 \pm 0.3$ \\
$-22 < M_B \leq -19$     &  $0.023 \pm 0.003$ & $1.6 \pm 0.4$ \\
\hline
\end{tabular}
\end{table}