**Table 2:** NGC 5218: observational results.
Parameter	Value
OVRO low resolution map
Integrated intensity, low resolution map	93 Jy ${\rm km~s}^{-1}$
Maximum in one beam ( $4\hbox{$.\!\!^{\prime\prime}$ }38\times4\hbox{$.\!\!^{\prime\prime}$ }08$ )	86 Jy ${\rm km~s}^{-1}$
Molecular mass, low resolution map	$1.3 \times 10^9~M_{\odot}$
Maximum projected gas surface density	2600 $M_{\odot}$ $\rm {pc^{-2}}$
OVRO high resolution map
Integrated intensity, high resolution map	51 Jy ${\rm km~s}^{-1}$
Maximum in one beam ( $1\hbox{$.\!\!^{\prime\prime}$ }79\times1\hbox{$.\!\!^{\prime\prime}$ }38$ )	34 Jy ${\rm km~s}^{-1}$
Molecular mass, high resolution map	$7 \times 10^8~M_{\odot}$
Maximum projected gas surface density	10 000 $M_{\odot}$ $\rm {pc^{-2}}$
Radio continuum (robustly weighted)
Flux density detected with MERLIN	13.7 mJy
Maximum in one beam ( $0\hbox{$.\!\!^{\prime\prime}$ }17\times0\hbox{$.\!\!^{\prime\prime}$ }16$ )	1.2 mJy
Radio continuum (700 k $\lambda$ uv-tapered)
Flux density detected with MERLIN	26 mJy
Flux density detected with VLA^a	26.2 & 27.2 mJy
OSO 20 m CO 1-0 results^b
Integrated intensity, center position	9.5 K ${\rm km~s}^{-1}$
Integrated intensity, 30'' east	6.5 K ${\rm km~s}^{-1}$
Integrated intensity, 30'' west	6.7 K ${\rm km~s}^{-1}$
Integrated intensity, 30'' north	No detection^c
Integrated intensity, 30'' south	2.5 K ${\rm km~s}^{-1}$
Integrated intensity, 45'' east	1.0 K ${\rm km~s}^{-1}$
Integrated intensity, 45'' west	No detection^c
OSO 20 m HCN and HCO⁺ results^b
Integrated intensity, HCN	0.45 K ${\rm km~s}^{-1}$
Integrated intensity, HCO⁺	0.35 K ${\rm km~s}^{-1}$

^a Condon et al. (1990), in 15'' and 5'' beams respectively. ^b In units of $T_{\rm A}^*$ .
^c At an rms noise level of 6 mK, at a resolution of 30 ${\rm km~s}^{-1}$ .

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