Ratio of the PSF contamination, , computed using Eq. (3) to the predicted amplitude of the cosmic shear signal, , across all 15 tomographic bin combinations. The red lines depict results from the KiDS-1000-v2 catalogue, whereas the grey lines show those from the KiDS-1000-v1 catalogue. The blue shaded regions represent a range of ±10% of the standard deviation of the measured cosmic shear signal. This deviation is determined from the covariance matrix using statistics from the KiDS-1000-v2 catalogue. The dotted horizontal lines indicate the 2% level of the predicted cosmic shear signal.