Relation between the IR-to-UV luminosity ratio (IRX) and the UV slope β. The yellow star shows the upper limit on the IRX calculated from the band 6 observations z7_GSD_3811. We also show the IRX and UV slopes of galaxies from the compilation of Matthee et al. (2019, dark gray circles). IRX values are calculated under the assumption of a dust temperature of 45 K and a dust emissivity index of β_d = 1.5. The solid and dashed line represent the Calzetti and SMC dust laws calculated following Bouwens et al. (2016). The dotted line shows the IRX-β relation from the ALPINE-ALMA survey data, derived by Fudamoto et al. (2020, see text). Galaxies from the Matthee et al. (2019) compilation that are also detected in [O III] are indicated by their names and a lighter gray color. Upper limits on the IRX are at the 3σ level.