Example of a chronological sequence of of the star KIC 7294867 (top plot) and the corresponding autocorrelation functions (bottom) against lag Δt for m = 1 (squares) and m = 2 (crosses). The quadratic trinomial approximations of ln(rm) at short lags (1 ≤ Δt/P ≤ 4) are shown as the dashed (m = 1) and dotted (m = 2) curves. The timescale ΔJD = JD − 2 454 833 in the top panel is the difference of barycentric Julian days (JD).
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