X_CI × α_CO, X_CI × α_[CII], and X_CI × δ_GDR (left column) and α_CO/α_[CII], δ_GDR/ α_CO, and δ_GDR/ α_[CII] (right column) as a function of T_dust for our sample. Our sample is represented in squares, colour-coded by the CO transition used to estimate the CO-based gas mass: CO(1-0) transition in purple, CO(2-1) in blue, CO(3-2) in red, and CO(4-3) in brown (top and centre rows). The green shaded region represents the 1 σ region around the sample mean. We also plot the linear regression best fit and the 1 σ region from Linmix as the black solid and black-dashed line, respectively.