Completeness–contamination parametric curves as a function of PSF-fitting detection likelihood DET_LIKE measured from the four sets of energy bands (blue, orange, green, and red lines). The purple line indicates the selection based on the aperture Poissonian likelihood measured in the 0.2–2.3 keV band within 60% EEF. The points corresponding to the serial of DET_LIKE values are marked on the lines.