Examples of feature importance derived from the RandomForest, CatBoost, and LightGBM classifiers when selecting quiescent galaxies from within the 0 < z < 3 interval, without foreknowledge of galaxy redshifts. For each learner, the feature importance values are normalised such that their sum is 1.0. The y axis labels correspond to feature names used by the pipeline after the pre-processing steps outlined in Sect. 4.2 have been applied and should be self-explanatory. For example, the feature named 'u' is derived from the u-band magnitudes (i.e. after our pre-processing steps), the feature 'VIS-20CM' is derived from the I_E − 20 cm colours, etc.