Fig. 1
Left panel: spectrum of ULAS J1537+0557 integrated over the beam. The solid line shows the Gaussian fit with 
km s-1 and centred at the frequency corresponding to the redshift of the source. Right panel: integrated map of CO(3–2). Contour levels are 1σ each (σ = 0.25 Jy km s-1). The synthesised beam is shown in the bottom-left corner.
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