**Table 1:** NGC 5218: adopted properties.
Parameter	Value
Center Position (J2000)...	$\alpha ~ 13^{\rm h} 32^{\rm m} 10.4^{\rm s}, \delta ~ 62^{\circ} 45' 39''$
CO-peak (J2000).............	$\alpha ~ 13^{\rm h} 32^{\rm m} 10.3^{\rm s}, \delta ~ 62^{\circ}\ 46' 04.0''$
Morphological type^a..........	SBb pec
Systemic velocity...............	2880 ${\rm km~s}^{-1}$
Distance^b..........................	39 Mpc
One arc second equals^b	189 pc
Position angle...................	$78^{\circ}$
$L _{\rm IR} ~^{c}$ ..................................	$3.1 \times 10^{10}~L_{\odot}$
H I^d...................................	3.9-7.7 Jy ${\rm km~s}^{-1}$
Adopted inclination^e.........	$45^{\circ}$
Adopted conversion factor $^{\rm f}$	$2.3 \times 10^{20}$ $\rm {cm^{-2}}$ (K ${\rm km~s}^{-1}$ )^-1
Adopted velocity convention	Radio LSR
Line ratio, ${^{12}\rm CO / ^{13}\rm CO}^{c}$ ....	9

^a Hubble (1926). ^b For H= 75 ${\rm km~s}^{-1}$ $\rm {Mpc^{-1}}$ . ^c Aalto et al. (1991). ^d Haynes & Giovanelli (1991), Theureau et al. (1998). ^e Derived from the ratio of the minor to major axis as defined in the RC3 catalog. ^f Arimoto et al. (1996).

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