QACITS position post-monitoring of the image of the target HR8799 onto the vortex mask in June (left) and October 2015 (right). The inner and outer estimators are plotted with blue crosses and red pluses, respectively. The dashed circles have a radius of 0.15 λ/DL = 13 mas. The color shade of the points becomes darker with time. Every data point corresponds to 20 s and 25 s of integration time in June and October, respectively.
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