Results of our systematic tests to compare PCA, I-PCA (GreeDS), and mustard. Each cell represents a different synthetic data set, and its color indicates which algorithm performed best according to the SSIM metric. The five disk morphologies are labeled along the x-axis (see Fig. 3 for details), the four empty data sets used for injection along the y-axis (see Table 2 for details), and the three contrast levels in the left (10⁻³), middle (10⁻⁴), and right (10⁻⁵) plots. White letters on a cell indicate which algorithm(s) did not detect the disk (p stands for PCA, g for I-PCA, and m for MUSTARD). Gray cells mean that no algorithm detected the disk. Black stars indicate that all five metrics (SSIM, Spearman, Pearson, Euclidean, and SAD) selected the same winner.