Relation between IRX and β as estimated by CIGALE in our sample. The symbols are identical to those of Fig. 3. The lines correspond to different previously published relations. The dashed black, solid black and gray lines respectively correspond to the starburst, unmodified SMC, and SMC with a modified Rv attenuation curves, as published in Reddy et al. (2018). The green and red lines correspond to relations derived by Fudamoto et al. (2020a) for stacked ALPINE galaxies at z ∼ 4.5 and z ∼ 5.5, respectively. The reasonably small range in the intrinsic UV slope β₀ and the distribution of the data with respect to various relations suggest that the dispersion is driven by variations of the attenuation curves across the sample.