Empirical conversion factor against column density (expressed in AV units) for the sub-regions of our sample. and represent the mass derived from Herschel column density data and the HCN luminosity for the portion of each sub-region corresponding to a given column density bin. The width of each column density bin is 4 mag in AV units. The horizontal lines indicate αHerschel − HCN for the various regions (see Table 6).
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