IRX versus L_FUV.The right-hand axis shows the equivalent attenuation in the FUV band in magnitudes using Eq. (5). Our data points are shown as red squares. We also show previous measurements at z ~ 3 from stacking of UV-selected galaxies in the COSMOS field by Heinis et al. (2014; cyan open squares) and LBGs detected in PACS by Oteo et al. (2013; blue open square). The dashed lines represent the region where LIRG and ULIRG lie.