Face-on “simulated” CO image of the Milky Way based on the clouds in this catalog, as seen by two hypothetical extragalactic observers. Left: with 40 pc resolution, matching the PAWS survey of M51 (Schinnerer et al. 2013). Right: with 400 pc resolution, simulating a galaxy 10 times further than M51. Units are in K km s⁻¹, and each image is displayed with a square root intensity scale.