Pdfs of the joint two-order statistics of the effective Einstein radius for different combinations of the first with higher orders as indicated in the upper right corner of each panel. The distributions are calculated for the redshift range of 0.5 ≤ z ≤ 1.0 on the full sky. The colour bar is set to range from 0 to the maximum of the individual joint pdf in each panel. The red error bars denote the observed effective Einstein radii as listed in .