Fig. 2
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Example of a dichroic ghost (left, 60 × 60 pixel – 18″ × 18″– cutout) and the automatic detection of the shape (red dashed line) based on edge detection using a circular Hough transformation (right). Also shown is the final model (cyan solid line) used for Q1 based on the detection values and the radius derived based on the magnitude of the source star (see Sect. 4).
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