Histograms of the time-averaged 14–195 keV flux (top), of the variability index V from the χ2 test (middle; the vertical dashed line indicates V = 1.3), and of the variability amplitude estimator SV (bottom) for the total sample of 613 AGN (black) and for the selected sample of 110 AGN (red hatched). We assigned V = 10 to those objects with Pχ2 < 10-6. SV could be computed for 464 of the BAT-detected AGN.
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