SPHERE/VLT scattered light observations of SR 21. From left to right: H-band observation with coronagraph, J-band observation without coronagraph, annotated H-band data, each normalized to its maximum flux. Rightmost panel: oversaturated cut of the r²-scaled H-band data. Shown in all cases is the Q_ϕ image. In the H-band epoch the gray hatched software mask indicates the coronagraph, while in J-band it indicates the inner working angle of the polarimetric observations. Indicated in both epochs is the size of one resolution element with white filled circles in the lower left corner.