Properties of QPEs as a function of energy plotted as histograms of their posterior PDFs. From upper to lower panels: difference between the QPE arrival times measured in different energy bands and the QPE arrival times measured in the 0.2 − 2 keV band, QPE duration, and count rate at the QPE peak. The energies considered are 0.2 − 0.4, 0.4 − 0.6, 0.6 − 0.8, 0.8 − 1, and 1 − 2 keV from lighter to darker histograms.