RMS contrast variation as a function of angular separation for Case 2 in I-band. The lines represent the azimuthal average of the standard deviation of the simulated coronagraphic residuals. One can interpret these data as the anticipated contrast degradation due to coating variations. We observe that order 2–4 coronagraphs do not have substantially different performance, with an RMS contrast variation near the inner working angle of ≈10^–8 for the TMT and ELT, and ≈5 × 10^–9 for the GMT. Order 6 coronagraphs have a much tighter standard deviation, which is below 10⁻¹⁰ contrast. These data suggest that segment-to-segment errors will not be a dominant effect that limits high-contrast imaging. For the curves that represent Case 1 and 3, please refer to the appendices.