Probability density function of the ratio between the enclosed mass calculated by the literature mass estimators and the true enclosed mass for all dispersion-supported simulated galaxies in our training dataset of mixed NIHAO and AURIGA simulations (solid histogram), and for galaxies from each simulation project separately (empty histograms with different line styles). In the case of the combined NIHAO and AURIGA dataset, the median ratio is represented by a vertical solid line, and percentiles 16th and 84th are depicted by dashed lines for the mixed dataset. The values of the median ratio and the 1σ dispersion range are shown. Each row represents the results from a different mass estimator.