Source-averaged gas–dust comparisons using the fixed-β = 2 dust quantities from the PGCC catalog. Panels (a) and (b) show ﹩{N}_{{{\rm{H}}}_{2}-{\rm{dust}}}﹩ vs. ﹩{N}_{{}^{13}{\rm{CO}}}﹩ and ﹩{I}_{{}^{12}{\rm{CO}}}﹩, respectively. Gray points and contours represent the source sample in each panel, and red solid lines show logarithmic linear fits to the full samples. Blue dashed lines, shown only in panels (a) and (b), give the corresponding single-component fits used to test the influence of multicomponent sightlines; the subsets are defined by one detected ¹³CO component in panel (a) and one detected ¹²CO component in panel (b). Panel (c) compares the catalog dust temperature, T_dust, with the ¹³CO-intensity-weighted excitation temperature, ﹩{\langle {T}_{{\rm{ex}}}\rangle }_{{}^{13}{\rm{CO}}}﹩; the green line marks equality.