Image Details
Caption: Figure 7.
Distribution of the beam detection fractions for the 12CO and 13CO (J = 1–0) lines (upper panel), and of the detection-fraction difference Δf = f12 − f13 (bottom panel). For each PGCC, ﹩{f}_{{\rm{\det }}}={N}_{{\rm{\det }}}/{N}_{{\rm{beam}}}﹩, where Nbeam is the total number of sampled beam positions associated with the source and ﹩{N}_{{\rm{\det }}}﹩ is the number of beam positions with detected line emission.
© 2026. The Author(s). Published by the American Astronomical Society.