**Table 3:** High resolution CO and RC image characteristics.
Galaxy	VLA data	RC- $\theta_{\rm maj}\times\theta_{\rm min}$	$\sigma_{\rm RC}$	CO- $\theta_{\rm maj}\times\theta_{\rm min}$	$D_{\rm maj}\times D_{\rm min}^{a}$	$\sigma_{\rm CO}^{b}$
		( $^{\prime \prime }$ $\times$ $^{\prime \prime }$ )	(mJy bm^-1)	( $^{\prime \prime }$ $\times$ $^{\prime \prime }$ )	(pc $\times$ pc)	(Jy bm^-1 km s^-1)
IC 342	B+D	$5.5\times5.0$	0.05	$5.6\times5.1$	$110\times97$	4.8
NGC 4258	AnB+D	$3.5\times3.3$	0.05	$6.1\times5.4$	$240\times210$	4.8
NGC 4414	B+D	$5.4 \times 5.4$	0.08	$6.4 \times 5.0$	$590 \times 460$	1.9
NGC 4736	B+D	$6.1 \times 5.1$	0.05	$6.9 \times 5.0$	$140 \times 100$	3.5
NGC 5005	B+D	$5.4 \times 5.0$	0.03	$6.2 \times 6.0$	$640 \times 620$	2.9
NGC 5033	B+D	$5.3 \times 5.0$	0.07	$6.1\times5.4$	$550 \times 490$	5.6
NGC 5055	B+D	$5.5\times5.0$	0.04	$5.8 \times 5.5$	$200 \times 190$	3.6
NGC 5194	B+C	$6.0 \times 4.8$	0.02	$5.8 \times 5.1$	$214 \times 188$	3.1
NGC 6946	B+C	$5.6 \times 4.9$	0.10	$6.0 \times 4.9$	$160 \times 130$	3.1

^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