H-band (top) and J-band (bottom) DPI observations of HD 163296 with SPHERE/IRDIS. Left column: Q_ϕ images, withthe right column showing U_ϕ. A single asymmetrical ring is observed in scattered light at ~0.6 arcsec from the center of the disk in both Q_ϕ images, slightly offset from center in the southwest direction. An additional bright inner component shows up in both bands, the center of which is obscured by the coronograph. Some residual signal shows up in both U_ϕ images, mostly constrained to the inner 0.2–0.3 arcsec. The white dashes indicate the position of the major and minor axes labeled a and b, respectively.