Example of stellar continuum modelling and its subtraction for high S/N nuclear spectra from MUSE (top panel) and MEGARA (bottom panel) data. The red line indicates the modelled stellar spectrum that matches the observed continuum, obtained applying the pPXF (Sect. 3.2). The wavelength regions blocked for the modelling are shown in grey. Spectral features are labelled at the top, and Balmer lines, forbidden lines, and absorption lines are shown in green, blue, and pink, respectively. In case of MEGARA we combined the cubes in LR-V and LR-R bands, which have a 70 Å overlap around 6130 Å (see Sect. 2.2).