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Fig. 4


Continuum-subtracted TiO717 (716.8 nm) image of IK Tau obtained form our SPHERE-ZIMPOL observations at post-maximum light (phase 0.27). The assumed angular diameter of the star (θD ≈ 21 mas) as well as its approximate position are indicated by the white circle. Regions with negative pixel values are shown in black. North is to the top and east to left.

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