Exemplary weighted & normalised radial number density profile for the eRASS1 cluster em01_046120_020_ML00096_002_c947 in KiDS-1000 with z_cl = 0.25, λ = 50.9, uncorrected for obscuration. One can observe an increase in the normalised source density for the low-redshift tomographic bin towards the cluster centre due to cluster member contamination. The high-redshift tomographic bins show a decrease in source density due to obscuration from cluster galaxies. The bottoms panel shows the corresponding varying reference number density (weighted with lensing weights).