Fig. 3
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Dependence of the image elongation, u, (upper panel) and the term η (lower panel) on the normalized separation, R/σ, (or on R/FWHM) for a few relative fluxes, z, including z = 0.663 valid for DE1756-45 (solid line). Large and small circles refer, correspondingly, to a seeing of 0.4″ and 0.8″ and the binary separation R = 0.156″ in 2019.
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