Observed IFU data. Panel A: g-band surface brightness map of CAVITY35843 and 35844, same as panel D of Fig. 1 but convolved to match the pixel scale of PPAK IFU data. Panel B: Signal-to-noise map of the PPAK data with the same contours as in Panel A. The black contour marks the S/N = 15. Panel C: Example of PPAK spectrum, in the rest frame, from a central spaxel in component A. Panels D and E: Examples of single-line Gaussian fits for [OIII]λ5007 and Hα emission lines, respectively. The best fit is shown in pink. Panel F: Fit over the stellar continuum of the same spectrum shown in Panel C using pPXF (see Sect. 3 for details).