Ratio of PSF contamination in the cosmic shear correlation function, ${\xi }_{+}^{\mathrm{sys}}$, to the predicted best-fit cosmic shear correlation function, ${\xi }_{+}^{\mathrm{\Lambda }\mathrm{CDM}}$. The statistic is shown relative to 10% of the 1σ uncertainty on our fiducial ξ₊ correlation functions (blue). We show only tomographic bin auto-correlations here, as the cross-correlation signals are extremely similar to the auto-correlations (i.e. combinations i − j;  ∀ j > i are quantitatively similar to the i − i signal).