Distribution of different star formation tracers. Distribution in longitude of: (A) the mean (black line) and the total mass (dashed line) per bin of the molecular clouds catalogued by Miville-Deschênes et al. (2017), (B) the SFF (dashed line) and the SFR (black line) calculated from the Hi-GAL catalog (Elia et al. 2021), and (C) the class I and II YSO counts extracted from the Marton et al. (2019; black line) and Kuhn et al. (2021; dashed line) catalogs, respectively.