Fig. 1
Contrast map of our high-resolution image taken with the 2.2 m telescope plus AstraLux at Calar Alto Observatory. Colour code corresponds to the S/N with which we would detect a theoretical source with a magnitude difference Δmi (y-axis) at the corresponding angular separation (x-axis). The two dotted lines represent the 3σ (lower line) and 5σ (upper line) contours.
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