... method¹

This is also the reason to choose a normalization for the scatter curve which cannot be interpreted in terms of the amplitude of the flickering relative to the background light as in my formulation of the 'ensemble' method: Any such interpretation would be misleading because the (generally) stronger flickering on longer time scales might not be seen with the 'single' method.

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... maximum²

This maximum is not to be confused with the unresolved central spike best seen in the ACF of the GK Per light curve. The latter feature is an artifact due to statistical noise which only correlates at zero time lag.

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