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Fig. 1


a) Qφ image of the ZIMPOL R-band data, smoothed with a boxcar of three pixels. No radial scaling is applied. b) Qφ image of the IRDIS/DPI J-band data, without radial scaling. c) Same reduction as shown in panel b), with an inclination (i = 45°) corrected r2 scaling. This panel has the following disk features annotated: The southern ansa of a ring (R1), a full ring R2, a clear dip in the surface brightness (G) and an inner disk structure I1. Panels d)f) display the Uφ images corresponding to and with the same dynamic range as the Qφ images of panels a)c) respectively.

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