Position-velocity diagrams of the [O I]λ6300 (top left), Hα (top right), [S II]λ6731 (bottom left), and [Ca II]λ7291 (bottom right) emissions of the HD 163296 outflow, corrected for the local standard of rest. The colour contours represent a 3σ detection, and the background contours are on a log scale up to 2σ. The bow shock in knot A is visible in Hα, [S II]λ6731, and [Ca II]λ7291 (see Table 1). The emission at the far edge of the [S II]λ6731 line is the red-shifted lobe of the [S II]λ6716 line.