Fig. 4
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Speckle interferometry. SAI-2.5m speckle sensitivity curve and autocorrelation function (ACF) for TOI-1820 (left panel), TOI-2025 (middle panel), and TOI-2158 (right panel). All images shown here were taken in the I-band. Only the speckle image of TOI-1820 shows evidence of a nearby companion, as can be seen by the bump in the ACF around 0.45 arcsec.
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