Distributions of all the single-band-detected sources as a function of detection likelihood. Purple, red, green, orange, and blue correspond to the five classes (1~5) of detected sources. The top, middle, and bottom panels display stacked histograms, differential fractions, and cumulative fractions, respectively. The dot-dashed, dashed, and dotted lines in purple and red indicate the three subclasses of no contamination, point-source contamination, and extended-source contamination, respectively. See Sect. 3.2 for details. The dashed black line indicates probability=exp(-likelihood). It is too low and almost drops out of the plotting scope of the middle panel.