**Table 4:** Integrated line ratios in the centres of IC 342 and Maffei 2.
Transitions	IC 342		Maffei 2
	Nucleus	Total Center	Nucleus	Total Center
${\rm ^{12}CO}$ (1-0)/(2-1)^a	$0.95\pm0.1$	0.9	$0.9\pm0.2$	0.8:
${\rm ^{12}CO}$ (3-2)/(2-1)^b	$0.73\pm0.10$	0.7	$0.75\pm0.13$	0.7
${\rm ^{12}CO}$ (4-3)/(2-1)^b	$0.67\pm0.10$	0.3	$0.65\pm0.10$	0.5
${\rm ^{12}CO}$ / ${\rm ^{13}CO}$ (1-0)^c	$10.7\pm1.3$	--	$8.6\pm1.1$	--
${\rm ^{12}CO}$ / ${\rm ^{13}CO}$ (2-1)^b	$7.2\pm1.5$	--	$10.0\pm1.4$	--
${\rm ^{12}CO}$ / ${\rm ^{13}CO}$ (3-2)^d	$10.2\pm1.4$	--	$12.4\pm1.7$	--
CI/CO(2-1)^b	$0.16\pm0.03$	0.06	$0.10\pm0.05$	--
CII/CO(2-1)^e	0.54		0.31

^a IC 342 ratio from Eckart et al. (1990), Xie et al. (1994) and Meier et al. (2000); Maffei 2 ratio from J=1-0 data by Weliachew et al. (1988); both ratios at 21'' resolution; ^b This Paper, JCMT at 21'' resolution; ^c Weighted mean based on ratios presented by Rickard & Blitz (1985); NRAO at 65'' resolution; Young & Sanders (1986); FCRAO at 45'' resolution; Weliachew et al. (1988); IRAM 30 m at 24'' resolution; Sage& Isbell (1991); NRAO 12m at 57'' resolution; Xie et al. (1994) FCRAO at 45'' resolution; Meier et al. (2000) OVRO at 4 $.\!\!^{\prime\prime}$ 5 resolution; ^d This Paper; JCMT at 14'' resolution; ^e From Crawford et al. (1985) and Stacey et al. (1991), KAO at 55'' resolution; JCMT convolved to 55'' resolution.

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