Bottom panel: moment-0 map of the CO(7–6) emission at the position of the brightest companion. Top panel: spectrum extracted from the beam-size area shown by the blue ellipse at the position of the companion sources in the bottom panel and is binned to 30 km s^-1 channels. The spectrum shows both the continuum and CO(7–6) line emission. The redshift of the line is consistent with the optical z = 2.1446 (Kuiper et al. 2011), which was taken as zero velocity in the spectrum.