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Fig. 4.


Average KiDS-1000 PSF ellipticity ϵPSF (left panels, divided by a factor of ten) and residual PSF ellipticity δϵPSF (right panels), indicated by the colour bar, as a function of stellar r-band magnitude and CCD chip ID. A flux dependence of the PSF residual is seen in CCD chip IDs 15, 21, and 30, indicating the presence of strong detector-level systematics in these three CCDs.

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