Set of points in the D × s plane such that C_s(ρ_P) = 1 for a planet at 0.1′′ (continuous curve) and at 0.5′′ (dashed curve) from the star (apodization parameter s and telescope diameter D). The intensity ratio star/planet is 10¹⁰. The curves show that there is a minimal diameter size required for exoplanet detection.