SOMs showing the photo-z performance in the COSMOS field. The first row exhibits the median predicted photo-z in colour space for the baseline network (first panel), including MTL training (second panel), with MTL and data augmentation with PAUS+COSMOS photo-zs (third panel), and the ground-truth redshift (fourth panel). The second row shows the bias in the photo-z predictions for the three training methods of the first row (first three panels). The third row follows the same scheme as the second but displays the photo-z precision. Finally, the fourth row shows the photo-z cell dispersion also following the same scheme. White cells correspond to empty cells, that is, cells without any galaxy.