Colour selection diagrams (left panels) for the selection of galaxies at z ∼ 15 − 20 (top) and z ∼ 20 − 30 (bottom). The cyan solid lines enclose the regions in which the reference sample to estimate the LFs are selected. The cyan dashed lines enclose regions where the additional extended samples are selected. The relevant redshift distributions of the selected reference (extended) samples are shown in the right panels as continuous (dashed) histograms. The points colour-coded according to the relevant redshift show objects from a mock generated over an area of 0.12 sq. deg., with low-redshift populations generated through the EGG software (Schreiber et al. 2017). Black stars show the position of brown dwarf models from Marley et al. (2021). All fluxes were perturbed with realistic noise properties to reproduce the typical depth of the JADES-GS field. Similar diagrams have been analysed for all fields using both the EGG- and JAGUAR-based simulations described in Sect. 1.