Histograms of the A parameter and angular extension, θ, of MCs fromthe MD16-catalog. White bars include all the clouds in the catalog, while the gray bars correspond to MCs in the inner Galaxy (|l| < 60°), and hatched bars correspond to MCs in the outer Galaxy (|l| > 60°). Top panel:number fraction with respect to the total is also reported as percentages, and the inset panel shows a zoomed-in view of the parameter range below 0.4 determined as the detection threshold of MCs by Fermi-LAT (Aharonian et al. 2020). Lower panel: average angular resolutions of the currently operating γ-ray telescopes are reported.