Impact of a redshift uncertainty ~1% on the stellar population parameters. On the left, we present the comparative one-to-one of the obtained parameters without any constrain in the photo z (Y-axis) versus the results forcing the redshift to its spectroscopic value (X-axis). The dashed red line represents the one-to-one relationship. Red, yellow, and blue dots are galaxies for which | z_spec − z_phot | > 0.2, 0.044 ≤ | z_phot − z_spec | < 0.2, and | z_phot − z_spec | < 0.044, respectively. On the right, we have the histograms of the differences between the obtained results with and without the spectroscopic constraint. The solid red line is the best fit of the distribution to a Gaussian function, and the boxes show both Gaussian mean and rms. From top to bottom, we show redshift, extinction, age, metallicity, and stellar mass.