Fig. 4
a) The ACF corresponding to the model LC of Fig. 3a showing three characteristic peaks at τ = 0 (self-correlation), ⋍ 14 (shown with arrow) and ⋍28 s. b) The ACF corresponding to the light curve of Fig. 3b for GRS 1915+105 (similar to Fig. 2c except for only T = 200 s here). While the addition of noise can make both LCs look random, their ACFs are fundamentally different.
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