Illustration of the result of the ACF for a relative error of a given shape parameter. We show the ACF for a single star (green) and a binary system (red). For simplicity, the noise level in the shape measurement is set to unrealistically low values. The shape parameters of the single stars are uncorrelated between exposures, thus the ACF coefficients are all zero, yielding the scalar quantity . The shape parameters are correlated for a binary system, and a strong auto-correlation between exposures is observed, with a high scalar quantity Σ = 10.
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