\begin{table}%t5
%\centering
\par
\caption{\label{table_paracmp}Properties of \object{NGC~3718} and
\object{NGC~5128}.}
\begin{tabular}{l|ll|l}
\hline\hline
& \object{NGC~3718} & \object{NGC~5128} & references\\
\hline
Host type & Sa$^a$& S0pec$^b$ & $^a$ Verheijen \& Sancisi (2001); $^b$ NED \\
Distance; Linear scale $[{\rm \frac{pc}{arcsec}}]$ & 13.2~Mpc; 64$^b$ & 3.4~Mpc;
16.5$^c$ & $^b$ NED; $^c$ Israel (1998)\\
App. $B$-magnitude  & 11.59~mag & 7.84~mag & $^b$ NED\\
Total mass  & $4.4\times10^{11}$~$M_{\odot}^d$ &
$(3\pm1)\times10^{11}$~$M_{\odot}^e$ & $^d$ Dickel \& Rood
(1978); $^e$ Mathieu et~al. (1996)\\
Molecular gas mass ($M_{\odot}$ 10$^8$) & 1.8 & 2$^f$ & $^f$ Wild \& Eckart (\cite{Wild2000})\\
Dust mass ($M_{\odot}$ 10$^5$) & 2.5 & 5.3$^g$ & $^g$ Eckart et~al. (\cite{Eckart1990a})\\
$M_{\rm {HCN}}(\mbox{H}_2)$ ($10^7$~$M_{\odot}$) & $\le6.6$ & 8.6$^f$ & $^f$ Wild \& Eckart (\cite{Wild2000})\\
$L_{\rm CO}(10^6$~K~km~s$^{-1}$~pc$^2$) & 51.2 & 92$^f$ & $^f$ Wild \& Eckart (\cite{Wild2000})\\
$L_{\rm HCN}(10^6$~K~km~s$^{-1}$~pc$^2$) & $\le$ 3.3 & 5.5$^f$ & $^f$ Wild \& Eckart (\cite{Wild2000})\\
$L_{\rm FIR}$($10^9$~$L_{\odot}$) & 0.28 & 6.0$^f$ & $^f$ Wild \& Eckart (\cite{Wild2000})\\
S(8.4~GHz) &  6.6~mJy$^h$& 1.74~Jy$^i$ & $^h$ Nagar et~al. (\cite{Nagar}), $^i$ Wright \& Otrupcek (\cite{Wright})\\
Position angle of major axis$^k$ & $-$85\degr & $125$\degr$^l$ & $^l$ Sparke (\cite{Sparke})\\
Inclination$^k$ & 60\degr & 73\degr$^l$ & $^l$ Sparke (\cite{Sparke})\\
\hline
\multicolumn{4}{l}{$^b$ NED: NASA/IPAC Extragalactic Database.}\\
\multicolumn{4}{l}{$^k$ For a prominent ring or disc
  in the molecular gas, which can be usedas the frame of reference for a {\em tilted
    ring}-model; see Sect.~\ref{sec_model}.}
\end{tabular}
\end{table}