Position-velocity diagram of the second gas component projected onto the disk major axis. Theplot is analogous to Fig. 28. The orange and red points between 0′′ < r < 500′′ , 0 km s⁻¹ < v < 100 km ⁻¹ and 100′′ < d < 200′′ correspond to the arm of zero velocity visible in Fig. 13. To the left of the center, there is an almost flat band of negative velocities, this is the zone of approaching velocities on the eastern side of the bulge in Fig. 13.