Top panel: multiplicative bias of galaxies with 20 < m_r < 24.5 after METADETECTION for simulated ground-based observations with a PSF that follows a Moffat profile with FWHM = . Middle panel: residual additive bias c_i if we do not correct the polarisations (orange) or use the standard KSB correction (red). Bottom panel: best estimate for b^sm as a function of . The blue points shows the results for a double Moffat profile with a large ellipticity gradient (see Sect. 5 for details). Also for this more complex PSF do we find a multiplicative bias that is consistent with zero.