Disk estimations obtained with PCA, I-PCA (GreeDS), and mustard for cube #4 and disk E. Details on the empty data sets can be found in Table 2 and Sect. 4.1. The three pairs of rows correspond to different injected contrast levels: 10⁻³ (top), 10⁻⁴ (middle), and 10⁻⁵ (bottom). The top row of each pair shows the estimations, while the bottom row shows the residuals. Each column displays the following: GT (left), PCA (middle-left), I-PCA (middle-right), and mustard (right). The best method, as determined by each metric, is indicated in the bottom-left corner of each pair of rows. More details are provided in the text of Appendix B.