Projection of clump contours, colored according to their assigned mean velocity (right scale). The map is in Galactic coordinates. The results of Zucker et al. (2018) and Galli et al. (2019) are superimposed as markers at their average direction and with the same color scale for their peak-reddening velocities. The areas investigated by Zucker et al. (2018) are designated using a Zx annotation, while the points of Galli et al. (2019) are marked out by aGx.