Image reconstruction under large systematic noises. Panels a, b, and c show reconstructed images for systematic OPD rms errors of 3.8, 7.5, and 11.3 nm, respectively. Panel d shows the noise floors for systematic OPD errors of 3.8 (black), 7.5 (yellow), and 11.3 nm (brown) were compared with the planetary signals (star symbol). The noise floor for each OPD error was calculated for a reconstructed 2D image without the planetary signals. The gray line shows the noise floor for the ideal case (i.e., only the shot noise) as a reference. Because the reconstructed planetary signals are slightly affected by the OPD error, the black, yellow, and brown star symbols represent the planetary signals for OPD rms errors of 3.8, 7.5, and 11.3 nm, respectively.