Solid angle as a function of magnification and redshift for the 11 clusters. Left panel: solid angle A(> μ) in the lens plane for each of the 11 clusters as a function of μ(z_s = 6). Right panel: cumulative solid angle A(> μ) in the lens plane for our entire sample for a source redshift from 1 to 6. The vertical dashed line shows the lower magnification limit μ_max = 1.5 that defines the field of view we investigated.