Line-of-sight velocity as function of galactocentric radius for four cones of 45° width as shown in Fig. 6. Black (red) symbols indicate the measured velocities for position angles lower (larger) than 220.5°, and the black (red) solid lines indicate the smoothed velocity from the LOESS algorithm (see Fig. 5). Data points around NGC 3309 and HCC 007 (open orange symbols in Fig. 6) were excluded.