Same as Fig. 7, but for a SOM trained on an unbiased FLASK field. The depletion functions are again shown as dashed red lines, although no depletions were applied. Irregularities in the A3 panel, for example, are discussed in Sect. 4.2. Data-points derived from lognormal random fields (green) are on average higher in n_gal than those from uniform fields (orange) because of the clustering of galaxies. The Cartesian grid we used to estimate the area of the sample has more empty cells for the GRF, hence the area is under-estimated and n_gal is over-reported.