Effects of SDI processing as a function of the separation and flux ratio (F1/F3) in noise-free images. Upward residuals have a flux ratio of 1 as an example; leftward residuals of 4.3, which is typical of a T7 dwarf; downward residuals have a ratio of 1.1, typical of a mid-L to early-T dwarf; rightward residuals have a ratio of 0.87, which is like that of 2M 0122 B. SDI residuals suffer from a strong self-subtraction (except for a highly methaned companion) and are thus difficult to characterize at small radii, i.e., in the region where the speckle pattern will be subtracted. The bifurcation point is at 1.9′′ with these PSFs.