PSF leakage and effective number density as a function of the resolution factor. The upper panel shows the measured PSF leakage, whilst the lower panel shows the effective cumulative distribution. The resolution factor ℛ is defined in Eq. (7), and the PSF leakage factor α is measured from the linear regression with Eq. (9). We perform the measurement to the weighted average ellipticity ϵ₁ (dark-red down-pointing triangle) and ϵ₂ (dark-orange up-pointing triangle) using the lensfit measurements before the correction of PSF contamination. The vertical red dashed line indicates the proposed resolution cut of ℛ < 0.9. The loss of effective number density due to this resolution cut is ∼2 per cent.