Fig. 20.
Three of the all-EPIC long-term variability parameters for point sources and their different dependence on the number of contributing observations. A low value of VAR_PROB and high values of FLUXVAR and FRATIO can indicate a long-term variable source. The dark grey area in the left panel indicates the 1σ range of the probability estimate for constant sources. All histograms are normalised to their maximum.
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