Examples of convergence map for z_s = 3 for a simulated cluster at z_l ∼ 0.4. The left, central, and right panels show the maps for the same halo in the 1xRF18, 1xR15, and 10xB20 samples. The solid white and yellow lines show the primary and secondary tangential critical lines. The dashed red line indicates the region where we identify the secondary critical lines for measuring the GGSL probability. The solid orange line shows the boundaries of this region on the source plane.