Scaling relations of the CO(3–2) clouds parameters in the SMC. Panel a: size and linewidth relation (σ_v – R). Panel b: luminosity–size relation (R – L_CO). Panel c: Luminosity and linewidth relation (σ_v – L_CO). Panel d: Luminosity-virial mass relation (L_CO – M_vir). Panel e: CO-to-H₂ conversion factor-luminosity relation (α_CO–L_CO). Black dots correspond to clouds with S/N ≳ 5, while the gray dots correspond to clouds with S/N between 3 and 5. For comparison, we plot the distribution of the CO(2–1) clouds in a blue color palette scale showing the concentration of the CO(2–1) clouds (Saldaño et al. 2023). In all the panels, the best fit for the brightest CO(3–2) clouds are indicated by dot-dashed lines. The Solomon et al. (1987) relation is indicated by dotted lines. Panel e: Dashed horizontal line indicates the median α_CO(3-2) of ${12.6}_{-7}^{+20}$ M_⊙ (K km s⁻¹ pc²)⁻¹.