Residuals and figures of merit of the MAG_PSFCOR J-spectra fits. Top-right panel: distribution of χ². The mean, median, and standard deviation of the χ² distribution are indicated. Top-left panel: mean value of the difference between the observed and the best-fitting model. The error bar is the 1 sigma uncertainty level for each filter, while the dashed lines are the global averages for the 1 and 2 sigma uncertainty levels. Bottom-right panel: distribution of the ratio between Δmag and the error for all the filters and galaxies. The mean, median, and standard deviation of this distribution are indicated. Middle- and bottom-left panels: variation of the mean and standard deviation for each filter. Upper panels: are for MAG_PSFCOR, and bottom panels: are for MAG_AUTO apertures.