Summary of the minimal variability time scales derived from the GeV data (in grey, Vovk & Neronov 2013) and TeV data (in green, this work). The arrows indicate the variability estimates for the specific sources from Table 1. The black hole light-crossing times tlc are shown by the solid blue (a = 0) and red (a = Rg) lines. The last stable orbit periods for the a = 0 and a = Rg cases are indicated by the blue and red dashed lines, respectively.
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