Errors in the images retrieved with our method applied to subset 6. The circles (squares) correspond to errors in images based on Rome/PSPT data taken at a high (low) activity period. The colours denote the different magnitudes of the inhomogeneities. The scale (relative to the background intensity variation from the limb to disc centre) is given in the topmost frame. The various backgrounds are numbered following Fig. A.11. a) Mean relative and b) rms difference between the NSB and the imposed background for all images, c) mean relative and d) rms difference between the retrieved contrast image and the original data. The values are given for disc positions within 0.98 R.
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