Comparison between VST and APASS magnitudes (Δ mag = m_VST − m_APASS) in u- (left), g- (middle), and r- (right) passbands. Blue dots represent all the sources in ugr-matched catalogue which is matched with APASS catalogue. Red dots represent the bright, unsaturated and point-like sources that we select for photometric comparison. Median and RMS_MAD values of Δ mag in the three passbands are shown by green horizontal line and shaded regions, respectively and the values are reported in Table 2.