Left: intensity map, cleaned and corrected for the NOEMA primary beam showing the detection of the two unresolved target sources at the center. Coordinates are reported as angular separations from the source J142626.1+333827. The velocity range considered is within −2000 km s⁻¹ and 0 km s⁻¹, corresponding to the CO(2−1) line, see right panel. Solid and dashed contour levels are superimposed and correspond to positive and negative fluxes, respectively. The dashed ellipse (bottom right) shows the beam size. Right: spectrum (black solid line) obtained with NOEMA within an aperture corresponding to the beam size at the location of the detection, i.e., the center of the intensity map. A resolution of 200 km s⁻¹ is adopted. The best fit, baseline subtracted, is reported (red dashed line). The center and the length of the blue horizontal segment at the top of the spectrum correspond to the HST WFC3 spectroscopic redshift and its uncertainty, respectively (Zeimann et al. 2013).