[O III] map (top-left) and integrated spectra of the dual AGN system associated with COS1638. The [O III] map is obtained by integrating the [O III] emission over specific velocity ranges (as labelled), in order to highlight the primary (AGN-A) and secondary (AGN-B) nuclei, together with additional structures at the same redshift of the active galaxies. The panels on the right show the integrated spectra of the primary (top) and secondary (bottom) AGNs, extracted from the circular regions labelled in the map. The legend displays the individual Gaussian components and best-fit curves shown in the spectra; best-fit total profiles are represented in red for AGN-A and in blue for AGN-B. Residuals, defined as the difference between the observed data and the best-fit model, are displayed at the bottom of each panel; average ±3σ uncertainties on the data are also reported with horizontal grey shaded regions. The vertical blue and green shaded areas correspond to the velocity channels used to generate the [O III] map and contours in the top-left panel, respectively. Both targets present broad lines due to powerful outflows.