Ionisation properties of the gas for the two components of J221024.49+114247.0. Left and middle panels: BPT (Baldwin et al. 1981) maps for both fitted components. Right panel: BPT diagram showing the position of the spaxels. The S/N threshold is set at 3. The spaxels where the S/N of at least one emission line is below the corresponding threshold are masked. Moreover, for the redshifted component, the masks described in Sect. 2.1 are applied. The last panel displays the LINER, AGN, composite, and star-forming excitation regions as defined by Kewley et al. (2001), Kauffmann et al. (2003), and Schawinski et al. (2007). The grey contours refer to galaxies representative of the RCSED sample.