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Fig. A.1


CO(32) maps (top panels) of serendipitous sources detected in the LBQS0109 field of view. The maps are obtained collapsing under golden shade region shown in their respective spectra (bottom panels). The black contours are at levels of − 2, 2, 3, 4, and 5 times the noise per beam in the same map (i.e. 0.06, 0.05, and 0.05 Jy/beam km s-1, respectively for the three sources). The ALMA beam is shown in the bottom-right corner of each map. The white contours indicate the continuum emission at levels of 2(− 2)σ, 3(− 3)σ, and 4σ. The spectra in the bottom panels are extracted from the centre of the sources. The 0 km s-1 corresponds into the redshift of LBQS0109.

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