IRX versus M_∗. The right-hand axis shows the equivalent attenuation in the FUV band in magnitudes, obtained using Eq. (5). Our data points and the best fit to Eq. (6) are shown as red squares and a red solid line, respectively. We show previous measurements at z ~ 3 from the stacking of UV selected galaxies by Heinis et al. (2014; dashed line), star-forming galaxies valid for redshift range 0.5−4 by Pannella et al. (2015; dotted line) and direct LBGs detections in PACS by Oteo et al. (2013; blue open square).