Archival NACO data reduction. A χ² map of the image for each double roll subtraction angle. The maps shown have been computed for position angles between 90° and 270° and separations between 20 and 50 pixels as the companion is completely excluded in the rest of the image by the orbital analysis from the RV, Keck, and SPHERE observations. Panel a: χ² map of the image with a double roll subtraction angle of 5°. Panel b: χ² map of the image with a double roll subtraction angle of 10°. Panel c: χ² map of the image with a double roll subtraction angle of 15°. Panel d: χ² map of the image with a double roll subtraction angle of 20°. Panel e: χ² map of the image with a double roll subtraction angle of 25°. Panel f: median χ² map over double roll subtraction angles. The minimum shows the position of the companion.