Line luminosities of CO 11−10 and 16−15, as a function of M_clump and L_bol IR-weak (24d) sources are shown with blue circles, IR-bright (IRb) sources with red triangles, and HII regions (HII) with green squares. The linear regression fit with Markov chain Monte Carlo is shown with dashed black lines and yellow shades. The linear log-log and Pearson correlation coefficients, r, are presented in each plot. Objects with self-absorption are shown with an upward arrow, indicating the lower limit for calculated luminosities.