LSR velocities of 988 GHz H₂O lines for twelve positions on the CND (see Fig. 6) represented as a function of the PA. Different symbols represent several sources in the H₂O map at 988 GHz: the CND (filled triangles), the 50 km s⁻¹ cloud (open squares), the 20 km s⁻¹ cloud (filled squares), and the Western Streamer (open circles). There are two velocity components in positions 5, 7, and 12, and three velocity components in position 3 (see text). The black dotted line represents our best fit of a rotating ring model to positions 1, 2, 4, 5, 7, 9, and 12. The error bars correspondto LSR velocity errors in the Gaussian fits. Error bars overlap with some symbols. The 5 km s⁻¹ velocity component in position 3 and both velocity components in position 7 do not have error bars as the velocity was fixed in the Gaussian fit.