**Table 2:** Low resolution CO and RC image characteristics.
Galaxy	VLA data	RC- $\theta_{\rm maj}\times\theta_{\rm min}$	$\sigma_{\rm RC}$	CO- $\theta_{\rm maj}\times\theta_{\rm min}$	$D_{\rm maj}$ $\times$ $D_{\rm maj}^{a}$	$\sigma_{\rm CO}^{b}$
		( $^{\prime \prime }$ $\times$ $^{\prime \prime }$ )	(mJy bm^-1)	( $^{\prime \prime }$ $\times$ $^{\prime \prime }$ )	(kpc $\times$ kpc)	(Jy bm^-1 km s^-1)
IC 342	D	$52 \times 44$	0.15	$55 \times 55$	$1.0 \times 1.0$	23.3
NGC 4258	D	$45 \times 45$	0.50	$55 \times 55$	$2.1 \times 2.1$	31.4
NGC 4414	C	$14 \times 14$	0.20	$55 \times 55$	$5.0 \times 5.0$	36.2
NGC 4736	D	$54 \times 54$	0.13	$55 \times 55$	$1.1 \times 1.1$	18.4
NGC 5005	D	$48 \times 48$	0.20	$55 \times 55$	$5.6 \times 5.6$	54.7
NGC 5033	D	$54 \times 54$	0.20	$55 \times 55$	$4.9 \times 4.9$	44.8
NGC 5055	D	$54 \times 54$	0.20	$55 \times 55$	$1.9 \times 1.9$	35.0
NGC 5194	D	$54 \times 54$	0.30	$55 \times 55$	$2.0 \times 2.0$	24.7
NGC 6946	D	$44 \times 40$	0.10	$55 \times 55$	$1.5 \times 1.5$	35.0

^a The linear resolution refers to the CO beam.
^b $\sigma_{\rm CO}$ is the rms level in the unclipped image of integrated intensity.

	1 Introduction
	2 Sample selection and data reduction
	3 Data analysis
	4 Results
	5 Discussion
	6 Conclusions
	Appendix A: Notes on individual galaxies
	References