Statistical distribution of the CO luminosity-to-H2 mass conversion factor (αCO) for each galaxy type. The symbols indicate the extreme values, quartiles, and median for each galaxy type. The statistical scatter is dominated by variations between snapshots and projections, the uncertainty on the molecular mass itself being a minor contribution to the scatter (see text). The gray dots show individual giant clumps in a representative high-redshift galaxy (see Sect. 3.2 and Fig. 3).
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