Averaged normalised rms contrasts of PD reconstructions of 10 MHD snapshots degraded with the wavefront errors shown in Fig. 1c. The noise levels were set to zero (panel a)), 10^-3 (panel b)) and 10^-2 (panel c)). Solid lines correspond to masked-pupil reconstructions, dotted lines denote annular-pupil reconstructions. The dashed and the dash-dot-dot-dotted line in panels (b)) and (c)) were obtained from applying an optimum noise filter instead of a fixed cut-off and masked and annular pupils, respectively. d)–f) Same as a)–c) but for mean contrasts of the difference images (I_MHD − I_PD)/I_MHD. The dash-dotted curves show the normalised contrast of the original MHD image and the contrast after convolution with the PSF of an ideal annular telescope, averaged over the 10 MHD snapshots.