Likelihood contours are shown in the Ω_m0-σ₈ plane for: a CFHT-like survey in the top row and a wide survey in the middle and bottom rows; three variants of the KSB method, i.e. KSB-tr in the left, KSB-1 in the middle and KSB-3 in the right columns; a wide PSF in the top and middle rows and a narrow PSF in the bottom row. The figure shows that cosmological parameters tend to be biased high for wide and low for narrow PSFs, and that the magnitude of the bias depends on the variant of KSB chosen.