Filtering of light curves using a log-normal distribution of counts in the 3–70 keV band. Left panels: Total light curve of each observation. The horizontal lines mark the adopted count rate limits, while the pink vertical bands indicate time intervals that were excluded from further analysis. Right panels: Logarithmic histograms of count rates, with horizontal lines denoting the same adopted limits, where good time intervals were defined as those corresponding to count rates within the ±5σ of the central peak of the log-normal distribution.