Fig. A.1.
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Image of the absorption feature at 87.9 GHz, made from the continuum-subtracted data using a 250-kλ uv-distance cut. The black contours start at ±2σ and increase in steps of 1σ, white contours indicate the Band 3 continuum. The absorption is not associated with the lensing arcs and is most likely due to a foreground CO(0–1) absorber at z ≈ 0.31.
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