Radial velocity map of H i from de Block & Walter (2006). The blue contours run from −55 km s^-1 in the inner part to −110 km s^-1 in the outer NW zone, in steps of 5 km s^-1. The red contours run from −50 km s^-1 in the central zone to +10 km s^-1 in the outer SE zone. The ellipsoid represents the stellar spheroid analyzed by Battinelli et al. (2006) and Demers et al. (2006). Position of the PNe (filled dots), H ii regions (crosses) and A-type supergiants (x marks) are those presented in Table 2. Blue symbols indicate a negative difference between observed objects and H i velocities. Red symbols indicate a positive difference. In black we plot objects with a velocity difference smaller than 12 km s^-1, relative to H i disk. A zoom of the central zone is shown.