Fig. 4.
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Distribution of the shortest detected TESS variability timescales of the sample, plotted against the black hole mass. The blue dashed lines indicate the different values of gravitational radii for the given black hole mass, and the green and red solid lines indicate the theoretical and measured accretion disc and corona sizes from literature (Shakura & Sunyaev 1973; Morgan et al. 2010; Dogruel et al. 2020).
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