Geometric model of a conical wind perpendicular to the galaxy disk. In both images, the black lines represent the wind cones. The receding cone (invisible for the observer in NaD, because of the lack of background light, i.e., the stellar disk) is displayed with dashed lines. The letters X and Y mark the major and minor axes of the galaxy. Left: the red, green, and blue boxes represent, respectively, the neutral, stellar, and ionized disks (see Sects. 4.1 and 4.3). Blue filled circles indicate the wind ionized phase (see Sect. 4.4 for details). Right: sketch of the bipolar GW and the spiral structure as derived using HST-ACS, VIMOS and SINFONI observations (Figs. 1, 4−6) overlaid to the NaD velocity field (Fig. 4). The outer tip of the trailing arms points in the direction opposite to galactic rotation (clockwise, as indicated by the dotted arrow). The symbols ⊗ and ⊙ indicate the receding and approaching sides of the disk rotation (as traced by Hα  and CO(2−0)). The closest part of the disk is at SW (see Sect. 4.4 for details). The insert with letters N and E indicate: the north and the east, with respect to the detector reference frame.