Left: optical image of Cen A in the range λ = 3850−5400 Å (provided by Malin et al. 1983 to Oosterloo & Morganti 2005) showing the diffuse emission and the location of the so-called inner and the outer filaments. The white contours denote the radio continuum emission of the inner lobes and the large-scale jet connecting the northern one to the base of the outer lobe (northern middle lobe). The black contours refer to the north-east outer H i cloud. Right: FUV image of the outer filament from GALEX. The black and red contours correspond to the H i and the Herschel-SPIRE 250μm emission, respectively. The dashed boxes show the field of view of MUSE observations (Santoro et al. 2015b). The blue dashed box indicates the region shown in Fig. 4.