Table 1: Global parameters of NGC 3718 and NGC 3729.
NGC 3718 NGC 3729 references

RA (J2000.0) $11^{{\rm h}}32^{\rm {m}}35{\hbox{$.\!\!^{\rm s}$ }}3$ $11^{\rm {h}}33^{\rm {m}}49{\hbox{$.\!\!^{\rm s}$ }}4$ NED^a

Dec (J2000.0) $+53\hbox{$^\circ$ }04'01''$ $+53\hbox{$^\circ$ }07'32''$ NED^a

Host type^b Sa SBab Verheijen & Sancisi (2001)

Nucleus type^c L 1.9 H Ho et al. (1997)

B-magnitude app./abs. (mag) 11.59/-19.01 12.03/-18.57 NED^a

R₈₀^B ^d 220'' 60'' Tully et al. (1996)

Radio flux density S [mJy] at 10.7GHz 8.5^e 6^f ^e Nagar et al. (2001), ^f Niklas et al. (1995)

Radio flux density S [mJy] at 1.49GHz^g 18.3 20.5 Condon (1987)

Radio flux density S [mJy] at 1.4GHz^h <50 <50 Hummel (1980)

Atomic gas mass $M_{\rm H}$ $6\times10^9$ ${M}_{\odot}$ $0.15\times10^9$ ${M}_{\odot}$ Schwarz (1985)

Total mass $400\times10^9$ ${M}_{\odot}$ $40\times10^9$ ${M}_{\odot}$ Schwarz (1985)

Position angle of major axisⁱ 15 $^\circ$ -16 $^\circ$ Verheijen & Sancisi (2001)

Inclinationⁱ 68 $^\circ$ 48 $^\circ$ Verheijen & Sancisi (2001)

Heliocentric velocityⁱ $993 \pm 1$ km s^-1 $1060 \pm 1$ km s^-1 Verheijen & Sancisi (2001)

^a NED: NASA/IPAC Extragalactic Database.

^b Morphological classification. S: Spiral; SB: Barred Spiral.

^c Spectroscopic classification. L1.9: LINER; H: HII nucleus.

^d Radius containing 80% of the radiation in the B-band.

^e Calculated with a spectral index of $\alpha=1.05$ based on flux densities at $8.4~\rm GHz$ and $15~\rm GHz$ .

^g Integrated VLA continuum flux density.

^h Total WSRT continuum flux density.

ⁱ From HI with PA pointing to the approaching major semi-axis.

**Table 1:** Global parameters of NGC 3718 and NGC 3729.
	NGC 3718	NGC 3729	references
RA (J2000.0)	$11^{{\rm h}}32^{\rm {m}}35{\hbox{$.\!\!^{\rm s}$ }}3$	$11^{\rm {h}}33^{\rm {m}}49{\hbox{$.\!\!^{\rm s}$ }}4$	NED^a
Dec (J2000.0)	$+53\hbox{$^\circ$ }04'01''$	$+53\hbox{$^\circ$ }07'32''$	NED^a
Host type^b	Sa	SBab	Verheijen & Sancisi (2001)
Nucleus type^c	L 1.9	H	Ho et al. (1997)
B-magnitude app./abs. (mag)	11.59/-19.01	12.03/-18.57	NED^a
R₈₀^B ^d	220''	60''	Tully et al. (1996)
Radio flux density S [mJy] at 10.7GHz	8.5^e	6^f	^e Nagar et al. (2001), ^f Niklas et al. (1995)
Radio flux density S [mJy] at 1.49GHz^g	18.3	20.5	Condon (1987)
Radio flux density S [mJy] at 1.4GHz^h	<50	<50	Hummel (1980)
Atomic gas mass $M_{\rm H}$	$6\times10^9$ ${M}_{\odot}$	$0.15\times10^9$ ${M}_{\odot}$	Schwarz (1985)
Total mass	$400\times10^9$ ${M}_{\odot}$	$40\times10^9$ ${M}_{\odot}$	Schwarz (1985)
Position angle of major axisⁱ	15 $^\circ$	-16 $^\circ$	Verheijen & Sancisi (2001)
Inclinationⁱ	68 $^\circ$	48 $^\circ$	Verheijen & Sancisi (2001)
Heliocentric velocityⁱ	$993 \pm 1$ km s^-1	$1060 \pm 1$ km s^-1	Verheijen & Sancisi (2001)

Source LaTeX | All tables | In the text

^a NED: NASA/IPAC Extragalactic Database.
^b Morphological classification. S: Spiral; SB: Barred Spiral.
^c Spectroscopic classification. L1.9: LINER; H: HII nucleus.
^d Radius containing 80% of the radiation in the B-band.
^e Calculated with a spectral index of $\alpha=1.05$ based on flux densities at $8.4~\rm GHz$ and $15~\rm GHz$ .
^g Integrated VLA continuum flux density.
^h Total WSRT continuum flux density.
ⁱ From HI with PA pointing to the approaching major semi-axis.