Same as Fig. 3, but now including the two LIRGs for which we have [CI](1–0) and CO(1–0) observations. The right part of the plot shows the resulting distribution of [CI]-based α_CO values. The dotted line indicates the CO-to-H₂ conversion factor for the Milky Way galaxy, and the dashed line corresponds to the value commonly used in the literature for (U)LIRGs (Downes & Solomon 1998). The mean and median values for the sample of (U)LIRGs remain the same as the ones obtained solely for the ULIRGs: α_CO = 1.9 ± 0.3 M_⊙ (K km s⁻¹ pc²)⁻¹ and 1.7 ± 0.4 M_⊙ (K km s⁻¹ pc²)⁻¹ for the mean and median, respectively.