CHI parameter (top panel) and SHARP parameter (bottom panel) as a function of m_F814W magnitude. Objects in red represent selected stars following the 3σ-rejection method, while black points are rejected stars. The solid black line represents the average CHI (top panel) and average SHARP (lower panel). It can be observed that both CHI and SHARP display an irregular pattern at brighter magnitudes, particularly for m_F814W < 17. This irregularity occurs due to the saturation affecting the magnitudes of these stars. Consequently, the average and standard deviation within these bins are affected, leading to the observed behaviour.