Normalized dust attenuation values A_λ/A_V for 01a (filled red stars) and for 01b (filled blue stars). Solid lines show various attenuation laws from the literature: the CF00 attenuation law in brown (Charlot & Fall 2000); the law measured in the inner regions of starburst galaxies in magenta (Calzetti et al. 2000, Calzetti00) a Milky Way extinction law in orange (Cardelli et al. 1989, CCM89) an extinction law based on red clump stars in green (Wang & Chen 2019); an attenuation law from a sample of galaxies at 0.75 < z < 1.5 in cyan (Battisti et al. 2022) and the extinction law measured in the Small Magellanic Cloud bar in purple (Gordon et al. 2003). The dashed red and blue lines represent the bestfit cubic polynomial to the 01a and 01b values, respectively.