Fraction of planets, as a function of mass, with orbital radii between 50–60 AU (eccentricity =0) that would be detectable in our H-band image are shown above, assuming COND (red line) and DUSTY (black line) models. The completeness does not reach 100% as some parts of the orbits are under the coronagraphic mask. Neptune-mass planets are massive enough to shape the HR 4796 A ring, but they are beyond our detection limits.