Piled-up distribution of the quality factors Q_N, Q_L, and Q_P for the PSZ1 sources (grey: confirmed clusters, blue: class1, green: class 2, red: class 3). The vertical solid line represents the cut separating the population of high- and low-quality detections. The 2D scatter plots show the cuts for the pair of quality factors under consideration. The vertical solid lines show the threshold Q_N = 0.4, Q_L = 1.5 × 10^-8, and Q_P = 7.4.