Impact on redshift estimation when two separate subsets are used for training and validation. The x-axis shows the ratio of objects (from to the full catalogue with r < 22 mag) that are used for testing. Each marking is comprised of 10 randomly selected subsets and is plotted as the mean value and standard deviation of the distribution of values. The blue points follow the percentage of objects that fit the J-PAS accuracy criteria while the green points follow the achieved median absolute deviation for the normalised distribution (σNMAD). The green points are shifted slightly right for better visibility.