XGBoost test set RMSE, OLF, and NMAD (starting from the upper-left panel and going clockwise) for different redshift intervals, SED types, numbers of missing bands, and i-band magnitudes. The grey curve shows the RMSE obtained by removing the two IRAC bands from the XGBoost input. The vertical pink bands indicate the fraction of objects belonging to the group with respect to the test set size. For details, refer to Table B.1.