Seyfert galaxies observed with miniJPAS and SDSS (see text in Sect. 4.2). The SDSS spectra are scaled to match the miniJPAS r band. The solid grey line represents the actual SDSS observation, and the blue line is a model developed by the SDSS team. We indicate in the legend the miniJPAS ID, the spectroscopic redshift of the object, the class-star yielded by SExtractor (CL), and the AB magnitude in the r band. We also show the probabilities obtained by the ANN₁ for each one of the classes, and we attach a multi-colour RGB image centred on the object covering 6.5 arcsec across. All objects except 2470-3341 are classified by the SDSS pipeline as QSOs.