Upper panel: ratio of the redshift distributions for r_SDSS = 25 after and before object selection for the HLR criterion with α = 2 (thick solid line: , thin solid line: ) and the FIX criterion with (thick dashed line). The case with a deeper limiting magnitude () than the magnitude cut for the lensing catalogue is represented by the double-dotted blue line. Lower panel: redshift distributions of the unfiltered galaxy catalogues with limiting magnitudes r_SDSS = 24 (solid line), r_SDSS = 25 (dashed line) and r_SDSS = 26 (dotted line).