Fraction of detections in which not all members belong to the same halo (contamination, left panel) and fraction of halos with at least two galaxies that are recovered (completeness, right panel), as a function of the maximum projected distance rp_max, for the mock samples at z = 2.4 (blue), z = 3.1 (magenta) and z = 4.5 (green). The total fractions are shown with solid lines, while the fractions corresponding multiples of 2 LAEs are shown with dashed lines, and multiples of 3 LAEs with dotted lines. Both the contamination and the fraction of recovered halos increases with the rp_max, so it is necessary to find a compromise value between them.