Vertical profile, Z vs. Y, for the main diagonal of the Z(X, Y) map (gray band). Molecular gas clouds (Zucker et al. 2020) placed along the main diagonal band are overimposed as yellow circles. The YOCs’ Kriging map and the molecular clouds show a similar trend, although the latter seems to show larger displacements with respect to the formal disk in the III Galactic quadrant. This connection between the gas and the YOCs establishes an important observational constraint for the origin of the phase-space structures.