Radial velocity maps. Left: map of the narrow component of the Hα line. This map is representative of all other narrow-line maps (e.g., narrow [O iii] λ5007, [O i] λ6300, [S ii] λ6717). Right: map of the He i λ7065 line. This map is representative of other broad-line maps (e.g., [O iii] λ4363, broad Hα). Contours are the monochromatic intensity of the corresponding emission-line from decreasing intensity intervals of 2 × 10^-17 erg cm² s^-1 in peak intensity for Hα and 10^-18 erg cm² s^-1 for He i. Only pixels above 3σ of the noise are shown for He i. In both panels, north is up and east is to the left.