Left panel: total Hα line flux map. Blue circles mark the regions from which the spectra shown in Fig. 3 are extracted (from top to bottom: diffuse component, low-velocity component, arc-like clumps, linear component). Black-filled circles mark the stellar light that is superimposed on the ionized gas emission. The location of the position-velocity plot of Fig. 2 is indicated with a green line. Right panel: RGB image of the Hα emission showing the linear (red), the diffuse (green) and the low-velocity (blue) components. At the bottom we indicate the intensity weighted mean heliocentric velocity of each component; note that Cen A v_sys ~ 540kms^-1. The regions where the overlap between the linear and the diffuse components is more evident are plotted in yellow.