Distribution in mass and redshift of 4000 maxima of the effective (left panel) and the median Einstein radius (right panel) in the redshift interval of 0.5 ≤ z ≤ 1.0 on the full sky based on the Tinker et al. (2008) mass function. The colour encodes the size of the individual largest Einstein radius from each simulation run. The green circles denote exemplary systems for which the two Einstein radius definitions selected different haloes as the maximum.