Comparison of SPHERE/IRDIS disk images in H23 reduced with ADI (left) and RDI (right). An arbitrary linear color scale is applied, which is normalized to the maximum flux in the RDI image of each target. Because the ADI images of HD 100546 and J1604 severely suffer from flux loss due to self-subtraction, we linearly scaled these ADI images by factors of 10 and 5, respectively. The star is located in the center of each image. The central gray region shows the position of the coronagraph mask with a diameter of 196 mas (16 pixels). The adopted FoV is 0.735″ in radius.