Left and middle panels: Hα and [S II]λ6717 flux maps, respectively, right panel: Hα radial velocity map. The radial velocity map shows radial velocities, relative to the mean value of the surrounding matter, and is scaled from −45 to 40 km s⁻¹. The circles labelled a through g identify theseven blueshifted knots. The upper and lower crosses in the right panel indicate the position of HH-N and HH-S respectively, while the black circle indicates the position of a point source identified in the NIR data (see Fig. 14).