KDE technique applied to select the likely size of a cluster during the decontamination procedure. From left to right: scatterplot, 2D histogram, Gaussian KDE, and 2D density with contours (or iso-densities) are shown for the ESO 92-18 (top panels) and Kronberger 100 (bottom panels) fields, used as examples. The green and yellow areas are indicate higher densities, while the blue areas show lower densities.