\begin{table}%t1
\caption { General characteristics of NGC~4666.}\label{t1}
%\centerline
{\begin{tabular}{ l  rl  l  l l  l  l l  l   l l  }
\noalign{\smallskip}
\hline\hline
\noalign{\smallskip}
Type$^{(a)}$ & RA$^{(b)}$  & Dec$^{(b)}$ & $D^{(c)}$ & $B_{\rm T}^{\rm i,0 ~(d)}$ & log~$L_{\rm B}^{0~(e)}$ &
  log~$N_{\rm H}^{(f)}$ & log~$L_{\rm FIR}^{(g)}$ & Incl.$^{(h)}$ & $R_{25}^{{\rm i,0} ~(i)}$ & 
log~$L_{0.5-2}^{(j)}$ & log~$L_{2-10}^{(k)}$ \\
        &(J2000) &(J2000) &  (Mpc)     &   (mag)  & ($L_{\odot}$) &
  (cm$^{-2}$) & ($L_{\odot}$) & (deg) & (kpc) & (erg/s) & (erg/s)  \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
 SABc & $12^{\rm h} 45^{\rm m} 09^{\rm s}$ & $-00^{\circ} 27^{\prime} 38^{\prime\prime}$ & 26.3 &
 10.68 & 10.76  &  20.23  &  10.69 & $80^{\circ}$ & 17.5 & 40.20 & 40.40 \\
\hline
\end{tabular}}
\smallskip
\par
$^{(a)}$ Morphological type, from {\it RC3} (de Vaucouleurs et~al. \cite{Vau91}).  
\par
$^{(b)}$ RA(2000) and Dec(2000), from {\it RC3} (de Vaucouleurs et~al. \cite{Vau91}).
\par
$^{(c)}$ Distance, from Dahlem et~al. (\cite{Dah97}). 
\par
$^{(d)}$ Total $B$-magnitude, corrected for Galactic and internal extinction, from {\it 
RC3} (de Vaucouleurs et~al. \cite{Vau91}).
\par
$^{(e)}$ $B$-band luminosity, derived using the quoted distance and $B$-magnitude.
\par
$^{(f)}$ Galactic HI column density (Dickey \& Lockman \cite{Dic90}).
\par
$^{(g)}$ Far-infrared (FIR) luminosity (from Dahlem et~al. \cite{Dah97}). The FIR flux is 
defined (Helou et~al. \cite{Hel85}) as a combination of the {\it IRAS} $60~\mu$m and $100~\mu 
$m fluxes according to $f_{\rm FIR} \equiv 1.26 \times 10^{-11} (2.58~ f_{60} + 
f_{100})$~erg~s$^{-1}$~cm$^{-1}$, where $f_{60}$ and $f_{100}$ are expressed in Jy.
\par
$^{(h)}$ Inclination angle with respect to line of sight (Dahlem et~al. \cite{Dah98}).
\par
$^{(i)}$ 25-$B$-mag photometric radius, corrected for inclination and Galactic absorption,
derived using the angular value given by {\it RC3} (de~Vaucouleurs et~al. \cite{Vau91}) and the 
quoted distance.
\par
$^{(j)}$ 0.5--2 keV luminosity, derived using the quoted distance and the data 
presented in this paper. Not corrected for Galactic absorption.
\par
$^{(k)}$ \mbox{2--10~keV} luminosity, derived using the quoted distance and the data 
presented in this paper. Not corrected for Galactic absorption.
\par
\end{table}