\begin{table}%t1
%\centering
\par
\caption{\label{fits_fhix}Parameters of the fits to the $N(\HI)$ frequency distribution (see Fig.~\ref{fhix}).}\small
\begin{tabular}{lcr rcr}
\hline\hline
\multicolumn{3}{c}{Double power law}    & \multicolumn{3}{c}{$\Gamma$ function} \\ 
\hline
 $k_{\rm d}$      &$=$&$-23.09$       & $k_{\rm g}$     &$=$&$-22.75$ \\  
 $N_{\rm d}$      &$=$&$21.27$        & $N_{\rm g}$     &$=$&$21.26$  \\  
 $\alpha_{\rm d1}$&$=$&$-1.60$        & $\alpha_{\rm g}$&$=$&$-1.27$  \\  
 $\alpha_{\rm d2}$&$=$&$-3.48$        &                &    &        \\   
\hline
\end{tabular}
\end{table}