Red: cuts of the diffraction intensity |Ψz(x, y)|2 for several serrated occulters in logarithmic scale. The vertical lines shows corresponding Boivin radii . Black: sharp-edged disk. Blue: apodized disk. Panel a: Nt = 64, Δ = 10 mm. Panel b: Nt = 64, Δ = 20 mm. Panel c: Nt = 512, Δ = 10 mm. Panel d: Nt = 1024, Δ = 30 mm.