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Fig. 2

image

Observed CO(3–2) -normalised CO SLED (without lensing correction) of the H-ATLAS SMGs, in which both Jup = 1 and Jup = 3 CO data are available. The inset shows a zoom-in plot of the flux ratio of CO(1–0) /CO(3–2). The grey histogram shows the ratio distribution, while the grey line shows the probability density plot of the line ratio (considering the error). A mean ratio of ICO(1–0) /ICO(3–2) = 0.17 ± 0.05 has been found for our lensed SMGs. This is 1.3 ± 0.4 times smaller than that of the unlensed SMGs of Bo13. For comparison, we also plot the SLED of the Milky Way and the Antennae Galaxy.

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