Distribution of MSE⁺. Left: histograms of MSE⁺ for different objects in different colors; the gray zone corresponds to the total distribution, all objects confounded. Right: solid line, all the configurations and regularizations are kept; dashed line, with the sparsest (u,v) coverage removed; dot-dashed line, with the bad regularizations removed; in gray zone, with the sparsest (u,v) coverage and bad regularizations removed.