Spatially integrated spectra of CO lines in the H-ATLAS sources. The red lines represent the Gaussian fitting to the emission lines. The detections are ≳3σ. Zero velocity is set to the CO line sky frequency according to the previously measured spectroscopy redshifts zspec given in Table 3. For CO(6–5) in G09v1.97, we also overlaid the ALMA spectral data (Yang et al., in prep.) in purple for comparison.
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