HST F814W image from Koekemoer et al. (2007), with ALMA CO(2–1) contours in blue at [3, 4, 5, 6] σ_{CO(2 − 1)} and ALMA dust-continuum in beige at [3, 5, 7, 9, 11] σ_dust. The beams are shown in the lower left, with sizes of 1.3″ and 0.8″ for the CO(2–1) and dust-continuum emissions, respectively. A scale is shown at the bottom right to represent the physical scales at the redshift of the system, i.e., z = 1.17.