Slope (β) of the UV-continuum of a galaxy as a function of the extinction/attenuation at 1600 Å (A₁₆₀₀). The solid black line show the Meurer et al. (1999) relation. The green dotted (red dashed) lines shows the β−A₁₆₀₀ relation for a galaxy with an intrinsic slope of β = −2.2, assuming that the dust attenuation is described by the Calzetti law (MEC_att).