Coronagraphic images of α Hya taken in the R_PRIM filter, the CLC-S-WF coronagraph and with image rotation 0°, 60°, and 120° (upper row). The lower row shows the mean of the derotated images (left), the median of non-derotated image (middle), and the mean of the rotated difference between non-derotated image and non-derotated median (right) as result of a simple roll-angle angular differential imaging procedure.
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