Density map as a function of the first and second principal components of the galaxies of Y3 DES Deep Fields (density plot in green and yellow), the galaxies of the training sample (red dots), and the limit in the principal components of the galaxies for which DNF provides a value of photo-z with an uncertainty, DNF_ZSIGMA < 1.0 (orange line) and DNF_ZSIGMA < 0.1 (bold black line), with this training sample. The red blob is less extensive than the green-yellow blob (where the highest density of galaxies is located) when we select only the galaxies with FLAG_DES = 4.