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Fig. A.1.

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HST ACS/F606W image of the J1226 field with ALMA [CII] contours (white). The first contour is at the surface brightness level of 0.21 Jy km s−1 beam−1, corresponding to S/N∼3. Subsequent levels increase as powers of 3 $ \sqrt{3} $. Inset axes show the integrated spectra of J1226-A.1 (top) and J1226-B (bottom).

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