Shear signal around BCG candidates selected with the reference “BCG-500” algorithm (top panels). The bottom panels show the difference in lensing signal between various BCG selection algorithms and the reference. The left-hand column shows the results for all clusters, the middle one for poor clusters and the right-hand panel for rich clusters. The error on the difference is simply approximated by the error on the reference shear measurement – the true error will only be slightly larger due to the large covariance of the results. The lensing signal around the “BCG-250” is clearly smaller at small projected separations, indicating that a higher fraction of these BCGs are miscentred.