Comb-CNN classification for the visually inspected test set (mergers: red circles; non-mergers: blue crosses). The scores predicted by the TNG-CNN and the HA-CNN are reported on the x- and y-axes, respectively. The shaded red or blue area defines the region of galaxies classified as mergers or non-mergers by the Comb-CNN. Sources in the white areas are labelled as unclassified.