Dependence of the galaxy density, n_eff, on TG weights, w_TG in the KiDS-Legacy-like mock catalogue. The data points represent the mean n_eff of ten equi-populated bins in w_TG. The solid line shows the linear fit to the aforementioned data points of their respective tomographic bin, labelled S1-S6. The dashed horizontal lines show the mean values of n_eff calculated from the galaxy samples with variable depth per tomographic bin, while the dashed horizontal lines show the values of n_eff for the respective galaxy samples without any spatial variations in the observational depth.