\begin{table}%T3
\caption{Galaxies studied by other investigators.}\label{tab3}
%%%\centerline
\par
{
\begin{tabular}{lcccccccl}
\hline\hline
Galaxy & $S_{60}/S_{100}$ & $D$ & $a_{25}$ &$L_{\rm{FIR}}/D^2_{25}$ & DIG 
morphology$^{\footnotesize a}$ & Radio halo & X-ray halo & Refs.\\ 
 & & [Mpc] & [$'$] & [$\rm{10^{40}~erg~s^{-1}~kpc^{-2}}$] & & (thick 
disk) & & \\
%\noalign{\smallskip}
\hline
NGC~4217 & 0.2511 & 17.0 & ~~4.9 & 8.85 & pl,pa & & & (9) \\
NGC~5403 & 0.2717 & 37.6 & ~~3.0 & 7.56 & n & & & (7) \\
NGC~3556 & 0.3841 & 14.1 & ~~8.1 & 6.74 & ee,h$_{\rm f}$? & $\bullet$ & 
$\bullet$ & (1);(10);(11)\\
NGC~4013 & 0.2360 & 17.0 & ~~4.8 & 5.51 & ee,f,h$_{\rm f}$ & & & (9) \\
NGC~4631 & 0.4292 & ~~6.9 & 14.8 & 4.22 & f,h$_{\rm f}$,pa & $\bullet$ & 
$\bullet$ & (5); (8) \\
NGC~5777 & 0.3745 & 30.5 & ~~3.1 & 4.07 & pl & & & (7) \\
NGC~4522 & 0.3235 & 16.8 & ~~3.5 & 2.15 & ee,eh2,f & & & (6) \\
NGC~973 & 0.4541 & 66.1 & ~~3.7 & 2.12 & n & & & (7) \\
UGC~3326 & 0.2696 & 56.4 & ~~3.4 & 1.86 & pl & & & (7) \\
NGC~3432 & 0.3313 & ~~7.8 & ~~6.9 & 1.82 & ee,eh2 & & & (2) \\
NGC~55 & 0.4423 & ~~1.3 & 27.5 & 1.79 & ee,eh2,f,pl,& & $\circ$ & (3);(4);
(14)\\
NGC~4762 & 0.4286 & 16.8 & ~~7.6 & 1.78 & n & & & (9) \\
NGC~5907 & 0.2788 & 14.9 & 11.7 & 1.64 & d & & & (9) \\
%NGC~300 & 0.3100 & & & 1.29 & & & & (4) \\
UGC~2092 & 0.3281 & 82.1 & ~~3.0 & 0.99 & pl & & & (7) \\
NGC~5746 & 0.1256 & 22.9 & ~~6.9 & 0.86 & d,n & & & (9) \\
NGC~4565 & 0.2381 & ~~9.7 & 14.8 & 0.68 & n & & & (8) \\
IC~2233 & 0.3464 & ~~7.7 & ~~4.6 & 0.32 & pl & $\circ$ & & (9);(12) \\
NGC~4244 & 0.1466 & ~~3.1 & 14.8 & 0.07 & eh2 & $\circ$ & & (5);(13) \\
\hline
NGC~4183 & & 17.0 & ~~5.1 & & d & & & (1) \\
NGC~5023 & & ~~6.0 & ~~5.9 & & pl? & & & (9) \\
UGC~9242 & & 26.3 & ~~4.9 & & ee? & & & (5) \\
%\noalign{\smallskip}
\hline
\end{tabular}}
\par
\medskip
$^{a}$ a~=~arc(s), d~=~disk emission (only 
planar DIG), ee~=~extended emission (locally), eh2~=~extraplanar 
\hbox{H~{\sc ii}} region(s), f~=~filament(s), h$_{\rm b}$ = bright halo, h$_{\rm f}$ = faint 
halo, n~=~no (e)DIG, pa~=~patch(es), pec~=~peculiar, pl~=~plume(s).
\par
\smallskip
References: (1) Collins et~al. (2000); (2) 
English \& Irwin (1997); (3) Ferguson et~al. (1996); (4) Hoopes et~al. (1996); (5) Hoopes et~al. (1999); (6) Kenney \& Koopmann (1999); 
(7) Pildis et~al. (1994); (8) Rand et~al. (1992); (9) Rand (1996); (10) Wang et~al. (2002); (11) Irwin et~al. (2000); (12) 
Hummel et~al. (1991); (13) Hummel et~al. (1984); (14) Schlegel et~al. (1997) ($\bullet$ = detection, 
$\circ$ = non-detection).
\end{table}