Comparison of the photo-z retrieved with our code using the redshift PDFs of BPZ2.0 as input values. The data correspond to a sub-sample of RS galaxies from ALHAMBRA with spectroscopic redshifts in the literature. Left panel illustrates the one-to-one redshift comparison for every galaxy, with the dashed line being the one-to-one relation. The bottom-right panel presents the differences between the photo-z and their spectroscopic counterparts for each galaxy, normalized by (1+z_spec). The top-right panel shows the obtained distribution Δz/ (1 + z_spec), indicating the accuracy parameters and the rate of outliers (Eqs. (22)–(24)) at the inner box.