Left: close up of the final Q_ϕ SPHERE/IRDIS-DPI image after removing low frequency structures (see text for details) and applying a Gaussian kernel of size 0.1 × FWHM to smooth the images and enhance the spiral features. Right: close up of the final U_ϕ image showing the positive and negative signal. The 93 mas coronagraph is indicated by the gray circle, and the cross indicates the position of the star. The flux is normalized to the maximum value in the Q_ϕ image.