Dependence of BCG and ICL mass on aperture size. Top: distribution of the ratio between the BCG mass of the THE THREE HUNDRED simulations obtained for apertures: 30 and 50 kpc (first row), and 50 and 70 kpc (second row). The left column (in green) is for GADGET-X, while the right one (in magenta) is for GIZMO-SIMBA. Bottom: same for ICL mass. Since ICL mass decreases with increased aperture, the ratio is inverted now to keep the values above 1, but the interpretation remains the same.