Left panel: polar projection of the SPHERE/CI result in K_s band. The image is corrected for the offset and the inclination of the best fit ellipse to ring A. The white dashed lines indicate the range of position angles in which we detect scattered light flux from ring A with an S/N higher than 5. Right panel: radial brightness profile of the disk and background noise. The blue curve shows the averaged disk signal for position angles in the range of 60° ≤ ϕ ≤ 240° and the gray curve represents the average noise over all remaining position angles. The envelopes indicate the corresponding standard deviations.