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Fig. 6
Cumulative distribution of the densities and the luminosities of CO(1−0), HCO+ (1−0) and HCN(1−0) for the whole galaxy. For example, ~90% of the gas particles have a density n < 102 cm-3, whereas 75%, 40%, 20% of the emission of CO(1−0), HCO+ (1−0) and HCN(1−0) emanate from gas whose density is lower than 102 cm-3.
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